1. I would have been here sooner but the rain kept me_______ * A. back B. from C. on D. up with 2. Keep children______from the fire. * A. in with B. from C. away D. back 3. It is the most important to keep _____ your neighbors. * A. touch with B. up with C. in with D. away from 4. He promised to keep _____ us while he was abroad. * A. in touch with B. up with C. in with D. away from 5. I took_______him at once, and we have been friends over since. * A. after B. to C. over D. up 6. Our teacher told us that if we don't _______the environment, our grandchildren may not even be able to carry on living. * A. look into B. look out for C. look after D. look for 7. He may have deceived you, but he didn't take me ______ * A. in B. off C. over D. up 8. I can't make______what he means. * A. up B. for C. out D. after 9. They are all making______the exit. * A. after B. out C. for D. against 10. The pain will soon pass _____ * A. away B. off C. over D. into 11. We must make_______some stories to explain our absence. * A. out B. away C. off D. up

Phương pháp làm bài tập này là chọn từ đúng để điền vào chỗ trống trong mỗi câu.
Câu trả lời:

1. B. from
2. C. away
3. A. touch with
4. A. in touch with
5. C. over
6. D. look for
7. A. in
8. C. out
9. C. for
10. A. away
11. D. up

Có thể có nhiều cách làm khác, nhưng đây là các câu trả lời phù hợp với nghĩa của từng câu.

1. I would have been here sooner but the rain kept me from coming. 2. Keep children away from the fire to ensure their safety. 3. It is the most important to keep in touch with your neighbors to build a sense of community. 4. He promised to keep in touch with us while he was abroad to maintain communication. 5. I took to him at once, and we have been friends ever since. 6. Our teacher told us that if we don't look after the environment, our grandchildren may not even be able to carry on living. 7. He may have deceived you, but he didn't take me in. 8. I can't make out what he means, I'm confused. 9. They are all making for the exit, trying to leave quickly. 10. The pain will soon pass away. 11. We must make up some stories to explain our absence.

Để giải bài toán "4000 giây = ? giờ phút giây", ta có thể thực hiện như sau:
- 1 giờ có 3600 giây
- Ta chia 4000 giây cho 3600 giây/giờ để tìm số giờ: 4000 ÷ 3600 = 1 giờ
- Số giây dư sau khi chia cho 3600 giây/giờ sẽ là: 4000 - 3600 = 400 giây
- 1 giờ = 60 phút, vì vậy 400 giây sẽ chia thành bao nhiêu phút: 400 ÷ 60 = 6.67 phút ≈ 7 phút
Vậy, kết quả là: 4000 giây = 1 giờ 7 phút 400 giây.