1.He had improved a lot _____ the start of the season. A.from B.since C.for 2. Everything will be cheaper _____ 9 o'clock tomorrow. A.from B.since C.for 3. I've had this watch _____ 25 years. A.from B.since C.for 4. We travelled to Italy _____ 20 to 25 July. A.from B.since C.for 5. I haven't seen her _____ the last meeting. A.from B.since C.for 6. I had to sit _____ a few minutes to rest my legs. A.from B.since C.for 7. We haven't talked to them _____ they got married. A.from B.since C.for 8. The concert started at 8 but the doors were open _____ 6:30. A.from B.since C.for 9. We've been walking _____ six hours. A.from B.since C.for 10. We've been working very hard _____ the beginning of January. A.from B.since

Since: chỉ mốc thời gian mà sự việc hoặc hành động bắt đầu xảy ra.

For: chỉ một khoảng thời gian mà sự việc hoặc hành động diễn ra, kéo dài trong suốt khoảng thời gian đó.

1. He had improved a lot _____ the start of the season.

A.from B.since C.for 

2. Everything will be cheaper _____ 9 o'clock tomorrow.

A.from B.since C.for

3. I've had this watch _____ 25 years.

A.from B.since C.for

4. We travelled to Italy _____ 20 to 25 July.

A.from B.since C.for  (Vì có 'to')

5. I haven't seen her _____ the last meeting.

A.from B.since C.for

6. I had to sit _____ a few minutes to rest my legs.

A.from B.since C.for

7. We haven't talked to them _____ they got married.

A.from B.since C.for

8. The concert started at 8 but the doors were open _____ 6:30.

A.from B.since C.for

9. We've been walking _____ six hours.

A.from B.since C.for

10. We've been working very hard _____ the beginning of January.

A.from B.since C. for