Можно ли ответить на do you have a best friend? no, i haven't

Можно:
-У тебя есть лучший друг?
-нет
И ошибок (в орфографии) нет

1. Do you have a best friend? No, I DON'T 
В каком времени задаётся вопрос, в таком же и времени должен быть и ответ.
ответ задаётся во времени Present Simple следовательно в таком же и времени должен стоять и ответ.
Таким образом можем понять что ответ No, I haven't - является неправильным. Так как он стоит во времени Present Perfect. 
Надеюсь объяснила доступно. 

Annotation to the master's thesis on the theme "environmental and economic problems of development of the oil and gas industry of the Caspian region of the Republic of Kazakhstan" on specialty 6М060800 "Ecology"
Relevance work.On today the mankind is on the threshold of global ecological crisis caused by unsustainable human activities. Therefore, at this stage, as ever, is becoming increasingly important to compliance with all environmental requirements for all entities. A modern economy is primarily to ensure the rational use of natural resources, which are necessary to perform in order to minimize negative environmental impact.
The purpose of this work.Consists in the study of ecological and economic problems and environmental protection measures in the oil and gas industry, also in the justification of the problems and prospects of oil and gas industry of the Caspian region.
To achieve the goals set forth the following scientific problems:
1) assess the oil and gas resources of the Caspian region;
2) describe the environmental problems;
3) to analyse the problems and prospects of oil and gas industry in the Caspian region;
Subject of research - economic and environmental problems of the Caspian oil and gas regions.
Scientific but a visa is not is developing a programme of measures for solving ecological and economic problems and assessment of prospects of development of the oil and gas industry of the Republic of Kazakhstan.
Approbation of the work. The main provisions of this thesis presented the theses of the scientific-practical conference devoted to the 50th anniversary of T. Ryskulov T.Ryskulov "current state of the oil and gas sector in Kazakhstan"and in the article "Problems and perspectives of the Caspian oil and gas complex" magazine "the Bulletin of the Kazakh economic University"
Structure and volume thesis. corresponds to the research aims and objectives and includes an introduction, three sections, conclusion, the list of sources and literature. 
In the introduction was described in the need to develop a qualitatively new approach to solving ecological and economic problems of development of the Caspian region. Such an approach should ensure the sustainable development of oil and gas complex of Kazakhstan, implying along with economic growth, the reduction of the technogenic load on the environment and observance of the rights of future generations to the use of natural resources of the country.
In the first Chapter was reviewed by the oil and gas complex development in the world.
The author suggested that oil and gas in the nearest future will remain the primary sources of energy for mankind, that oil and gas have played and will play an important role in human life. Despite the expansion of the use of nontraditional, renewable sources of energy in the foreseeable future, oil and gas will remain the major energy resources in all countries of the world. Another thing that will be a redistribution of roles between them: motor fuels derived from oil, will gradually be replaced with compressed and liquefied gases.
In the second Chapter was reviewed by the oil and gas complex development in the Republic of Kazakhstan, namely in the Caspian region, analyse the environmental problems of the region.
The third section describes the prospects of development of the oil and gas industry of the Caspian region.
In conclusion, on the basis of the conducted research, and analyze sources and literature on this subject, it is possible to make the following conclusions:
-in General, the oil complex currently has sufficient sources of investments for the realization of the considered directions of its development and oil and gas services - it is an effective instrument for the realization of geopolitical and geo-economic goals.
-protection of mineral resources envisages a complex of measures to prevent losses of oil in the ground due to low quality of sinking wells, violation of technology in developing oil fields and operation of wells, leading to premature irrigation or degassing reservoirs, flow of fluid between productive and neighboring levels and the destruction of oily rocks, casing and cement her.
-environmental protection provides for measures aimed at ensuring security of settlements, rational use of land and water, preventing pollution of surface and groundwater, air pollution, protection of forests, nature reserves, protected areas, etc.

Самую необычную вещь котору я видела-Машина-фургон, в которой есть диван, телевизор и даже кухня.

Люди занимаются серфингом на море, во время бурных волн.

Моя мама на праздники накрывает стол

бОЛЬШЕ ВСЕГО Я ПОХОЖА НА МАМУ, У НАС С НЕЙ ОДИНАКОВЫЕ ГЛАЗА И ЧЕРТЫ ЛИЦА.

Белки имеют кустистые хвосты

Люди увлекающиеся разными сферами деятельности, читающими много книг называют любознательными

Да хорошо так как у тбя много друзей

Самые красивые животные это леопарды, они грациозные и быстрые

Люди могут сбежать отвсюду, если есть желание

Кустарники обычно растут в лесах. Это: боярышник, крыжовник, шиповник и волчья ягода

 

Надеюсь лучшее решение мне обеспечено