We never (buy) souvenirs слово в скобках надо поставить либо в present simple, либо в present continuous

1) We never buy souvenirs. (Present Simple)

1. Last week Jack had to do a lot of things that his mother usually does. – На недели Джек должен был сделать много дел (вещей), которые обычно делает его мама.

2. Our earth may be warmed by “green-house effect”. – Наша Земля возможно нагревается через парниковый эффект.

3. Taking a trip down the River Thames to the Tower of London you can get a glimpse of six London bridges. – Осуществляя поездку по Реке Темзе  к Лондонскому Тауэру (башне) вы можете увидеть 6 лондонских мостов.

4. I am sure they shouldn’t get married. – Я уверен, им не следует жениться.

5. People are not able to see well in the evening, in order to see well they must light a lamp. – Люди не могу (не хорошо видеть вечером, для того чтобы видеть хорошо они должны включить лампу.

6. Yesterday I was to meet her at the station at 3 o’clock but the train was late. – Вчера Я должен был встретить ее на станции в 3 часа, но поезд задержался.

1.EVERYBODY HAS HEARD OF THE MAIN DISTRICT OF LONDON
Has everybody heard of the main district of London?
Has everybody heard of the main district of London or Moscow?
Everybody has heard of the main district of London, haven't they?
Who has heard of the main district of London?
What has everybody heard about? 

2.PEOPLE READ BOOKS BY ENGLISH WRITERS
Do people read books of English writers?
Do people read books of English or Russian writers?
People read books of English writers, don't they?
Who reads books of English writers?
Whose books do people read?

3.THERE ARE MANY PARKS IN THE CAPITAL OF GREAT BRITAIN
Are there many parks in the capital of Great Britain?
Are there many parks or monuments in the capital of Great Britain?
There are many parks in the capital of Great Britain, aren't there?
Where are there many parks?