Đáp án

1. since

2. for

3.for

4.since

5.for

6.for

7.since

8.since

9.since

10.for

Giải thích các bước:

Cấu trúc :Since + mốc thời gian 

               For + khoảng thời gian

1. She's lived here since 1975.

2. He's been in London for five days.

3. They haven't been used for many years

4. She's been working since nine this morning

5. I haven't eaten for hours

6. It has been raining for ages

7. India has been independant since 1947

8. They have been married since October

9. How many years is it since you graduated from high school?

10. We have been waiting for twenty minutes.