Сиспользовать настоящее совершенное или настоящее неопределенное; 1. our family (to eat) dinner at home on saturdays and sundays. 2. our family (to eat) dinner at home since grandma came to live with us. 3. i (to know) alice very well. 4. i (to know) alice since school time. 5. mr. brook (to be) our english teacher. 6. mr. brook (to be) our english teacher for a year. 7. they (to be married) for 10

this school year we have visited many interesting places. - верно.we have gone to the excursion of the museum this month. - после глагола go только to  it was interesting because there were a lot of beautiful pictures  in the museum which we liked very much. - здесь не скажешь в present prefectalso the museum guide has told us very interesting history about these famous pictures. - так тоже не говорят, но с точки зрения грамматики предложение построено верно.we were happy because we have already gone to this excursion and have learnt a lot. - то же как и в предыдущем предложении, лучше было бы просто в past, но раз только в present perfect, пусть будет так.best of all i liked waching the pictures which i have never seen before. - больше всего мне понравилось рассматривать картины, которые я никогда не видела раньше.

to be a teenager is very difficult and everyone has different problems. one of them is schooling- the attitude of classmates' or teachers' to them. to come over these problems teens should try to be calm and respect parents. for example i'm also a teenager but i have never done anything stupid to look cool in front of my friends.  bad habits like smoking, drinking, taking drugs can not be cool! so this is nonadequate self-esteem. too much pressure is put on me by my teachers and parents but i don't get annoyed with theirs behavoiur. i know a lot of boys and girls, who think that cleaning their room is the most important problem of humanity. they think it’s boring and useless. so they should change their lifestyle to have better life because the teenager years are happy stage in our life.