1. When the fog lifts, we _______where we are. *   A. could see B. will be able to see C. must have seen D. are seeing 2. The swimmer was very tired, but he________the shore before he collapsed. *   A. was able to reach B. can reach C. could reach D. has reached 3. If a letter comes for me, ________you please forward it to this address. *   A. shall B. could C. must D. should 4. Laura, you and the kids just have dinner without waiting for me. I ______work very hard today. *   A. can B. may C. should D. would 5. Leave early so that you________miss the bus. *   A. didn't B. won't C. shouldn't D. mustn't 6. Twenty years ago, David_______speak Arabic fluently. Now he's forgotten a lot. *   A. could B. might C. needed D. must 7. Jessica hasn't made up her mind about where to go to school. She________attend Duke University. She just doesn't know yet. *   A. mustn't B. may not C. needn't D. can't 8. This box isn't as heavy as it looks. You ________help me with it. Thanks anyway for offering to help. *   A. must B. mustn't C. might D. needn't 9. Yesterday everyone in the office________leave the building for a fire drill. I am glad it wasn't a real fire. *   A. may B. might C. must D. mustn't 10. You________play loud music at night. The neighbors will call the police. *   A. mustn't B. needn't C. might not D. couldn't 11. You________stand up. There are a lot of seats available on the bus. *   A. couldn’t B. mustn't C. needn't D. might not 12. People who use public parks_______clean up after themselves. *   A. must B. may C. ought D. might 13. This library book is overdue. I________better return it today. * A. need B. must C. might D. had 14. Our company provides free advice on the use of our products. You_______pay us. * A. must B. have to C. needn't D. mustn't 15. Whatever_______come, I will always be by your side. * A. must B. may C. could D. need 16. "________you hand that book, please?" "Sure. Here it is." * A. Could B. Should C. Must D. May

Để giải các câu hỏi trên, ta cần phân tích các điều kiện trong câu đề bài và chọn đáp án phù hợp nhất. Dưới đây là cách làm và câu trả lời cho mỗi câu hỏi:

1. "When the fog lifts, we _______where we are."
- Đáp án phù hợp: B. will be able to see

2. "The swimmer was very tired, but he________the shore before he collapsed."
- Đáp án phù hợp: A. was able to reach

3. "If a letter comes for me, ________you please forward it to this address."
- Đáp án phù hợp: D. should

4. "Laura, you and the kids just have dinner without waiting for me. I ______work very hard today."
- Đáp án phù hợp: C. should

5. "Leave early so that you________miss the bus."
- Đáp án phù hợp: B. won't

6. "Twenty years ago, David_______speak Arabic fluently. Now he's forgotten a lot."
- Đáp án phù hợp: A. could

7. "Jessica hasn't made up her mind about where to go to school. She________attend Duke University. She just doesn't know yet."
- Đáp án phù hợp: B. may not

8. "This box isn't as heavy as it looks. You ________help me with it. Thanks anyway for offering to help."
- Đáp án phù hợp: D. needn't

9. "Yesterday everyone in the office________leave the building for a fire drill. I am glad it wasn't a real fire."
- Đáp án phù hợp: B. might

10. "You________play loud music at night. The neighbors will call the police."
- Đáp án phù hợp: A. mustn't

11. "You________stand up. There are a lot of seats available on the bus."
- Đáp án phù hợp: C. needn't

12. "People who use public parks_______clean up after themselves."
- Đáp án phù hợp: A. must

13. "This library book is overdue. I________better return it today."
- Đáp án phù hợp: B. must

14. "Our company provides free advice on the use of our products. You_______pay us."
- Đáp án phù hợp: C. needn't

15. "Whatever_______come, I will always be by your side."
- Đáp án phù hợp: B. may

16. "Could you hand that book, please?"
- Đáp án phù hợp: A. Could

Đó là các câu trả lời cho từng câu hỏi trong bài tập.

Jessica hasn't made up her mind about where to go to school. She may not attend Duke University. She just doesn't know yet.

Twenty years ago, David could speak Arabic fluently. Now he's forgotten a lot.

Leave early so that you won't miss the bus.

Laura, you and the kids just have dinner without waiting for me. I may work very hard today.