1/ do you

2/ study 

3/ had

4/ is opened to all students every day by people.

5/ was going to visit her sister.

6/ do you 

7/ if i could use a computer. 

8/ lived 

10/ was built 2 years ago by people. 

11/ is spoken all over the world by people.

12/ knew

13/ were taken last summer.

14/ isn't

15/ were taken to the zoo last Sunday.

16/ weren't

17/ where I live.

18/ can be solved easily.

19/ I wish the weather was hot.

20/ If we didn't have to work tomorrow afternoon, we could meet you.

21/  Mai said she was having a wonderful time there.

22/ haven't you

23/ doesn't speak 

24/ are cooked everyday for her family.