Chia động từ: 1. Why did you walk six flights of stairs? You (take) the lift. 2. Is anyone opposed (implement) this policy? 3. Why do you keep looking back? Are you afraid of (follow)? 4. Larry drove all night to get here for his sister's wedding. He (be) exhausted by the time he arrived. 5. At the bottom of the hill (lie) many houses. 6. (Not be) it for his assistance in those days, I wouldn't be so successful now. 7. The Swedish scientist, Alfred B. Nobel, left money (award) to people who have done something important to help mankind. 8. If I had known that he (be) in hospital, I would have visited him