hoàn thành câu sau: 1He tries (stop)______ (smoke)______ , but he can't. 2. The rain prevented us from ( play) ________ football. 3. I am used to (get)_______ up early in the morning. 4. He went on (speak) _______ although none was paying attention. 5. John forgot (turn)________ off the lights when he went to bed. 6. I really enjoy (stay)____ at home and (watch)______ TV. 7. (Get)______ enough sleep is very important for your health. 8. (Smoke)_______ is not allowed inside this building. 9. (Walk)______ along the beach is a great way to relax. 10. I hope (study)_______ better on the next school year. 11. Can you (afford) ______ to buy that car? 12. Don't forget (send)_____ me a letter. 13. We started early so as to avoid (get)______ traffic jam. 14. You should practise (speak)_______ English every day. 15. Mr James agreed (sign)____ the contract with our company. 16. The teacher caught us (cheat)______ during the test. 17. I can't help (feel)_______ I've forgotten something. 18. My sister started (work)______ as a teacher in 1999. 19. Can you teach me how (do)_______ this exercise? 20. We've arranged (meet)_____ Lan at the restaurant at night.