Ai làm giúp e với ạ 1. John (watch) _____________ TV when his friend (ring) ___________ him up last night. 2. You (be) able to speak English better if you (learn) ______________ harder. 3. How much time do you spend (watch) ____________________ TV every day? 4. Nam (not visit) ____________________ the museum with his class last Sunday because he (catch) ____________________ a cold. 5. Boys like (play) ____________________ marbles while girls enjoy (skip) ____________________ rope or chatting. 6. There (be) ____________________ big problems in many parts of the world. 7. They (play) ____________________ badminton next week. 8. Duyen (not go) ____________________ with us to the museum next weekend. 9. David never (take) ____________________ the bus to school. 10. Most shops usually (open) _____________ at 8.00 a.m. and (close) ______________ at 6.00 p.m. 11. I (already / read) ____________________ that book. It’s fantastic. 12. We (not do) ____________________ any volunteer work five years ago. 13. James (do) ___________________ lots of volunteer work when he was in high school. 14. I think people (eat) ____________________ more healthy food in the future. 15. People (need) ____________________ about 2,000 calories a day to stay in shape. 16. (Alex / ever / be) ___________________ to Seattle? - Yes, he (be) ____________________ to Seattle once. 17. Right now, Margaret (have) ________________ a shower. Do you want to ring later? 18. Be a Buddy (establish) ____________________ in 2011. 19. We encouraged people (recycle) ____________________ bottles, cans and paper. 20. My mother enjoys (do) ____________________ charitable work