1. He hasn't visited his hometown _____ he graduated from university.

• since
• for
• yet

Answer explanation

Since + mốc thời gian (mệnh đề QKĐ).

2. She has worked as a freelance writer _____ several years.

• for
• since
• so far

Answer explanation

For + khoảng thời gian (several years).

3. This is the _____ I have ever had to wait so long for a bus.

• first time
• already
• for

Answer explanation

Cấu trúc It's the first time...

4. Have they announced the winner _____?

• yet
• already
• for

Answer explanation

Yet (chưa) thường dùng trong câu hỏi.

5. _____, the team has performed exceptionally well this season.

• So far
• Since
• For

Answer explanation

So far (cho đến nay) đứng đầu câu để cập nhật tình hình.

6. We have _____ finished the main course, so now it's time for dessert.

• already
• since
• yet

Answer explanation

Already (đã...rồi) đứng giữa have và V3.

7. The climate has changed dramatically _____ the last century.

• since
• for
• until now

Answer explanation

Since + mốc thời gian (the last century).

8. The children have been playing outside _____ two hours.

• for
• since
• already

Answer explanation

For + khoảng thời gian (two hours).

9. _____ his promotion until now, he has been much busier.

• From
• Since
• For

Answer explanation

Cấu trúc From... until now.

10. This is the _____ that specific bug has appeared in the software.

• third time
• already
• for

Answer explanation

Cấu trúc It's the... time...