1.1 for

2 for

3 since

4 since

5 since

6 since

7 for

8 since

9 since

10 since

2.1 minh hasn't written to his pen pal for five months

2 I haven't visited to kula lumpur for 3 years

3 how long have you studied english?

4 they have built this house for 2 months

5 my father has worked for in this factory for a week

6 when did he work in the garden?

7 how long have you learnt music?

8 he has lived in ho chi minh city since he was 18 

9 he has learnt english since he was 18

3.1 letters are typed by mary in the office

2 I will be helped tomorrow by my father

3 this bottle was broken by peter

4 english is being learnt in the room

5 the children will be brought to home by my students

6 they were given more information

7 the engine of the car has to be repaired

8 a lot of money is spent on advertising everyday

9 a cake is being cut with a sharp knife by mary

10 a story is going to be told by teacher