Tìm dấu hiệu, giải thích giúp mik với 1. Make sure you ............ the electricity before you ...............mending this light switch A. disconnect / start B. are disconnecting / were starting C. disconnect / started D. disconnect / will start 2. Because anxiety often.... more than one cause nd is experienced in highly in dividual ways, its treatment usually.... more than one type of therapy A. will have / was requiring B. has / requires C. had / will be reuiring D. has / had required 3. Most people ...........being disturbed while they ........... A. don't like / are working B. would like / worked C. like / worked D. don't like / didn't like 4. In public pools, there ---- a much higher level of safety with trained lifeguards on duty whenever they ---- open A. will be / were B. was / are C. is / are D. would be / are 5. The Internet ---- computer users easily to connect to other computers and information stores wherever they ---- across the world. A. allows / are B. allowed / will be C. will allow / would be D. were allowing / will be 6. Columbus .........................America more than 400 years ago. A. discovered B. has discovered C. had discovered D. he has gone 7. He fell down when he ......................towards the church. A. run B. runs C. was running D. had run 8. We ...........................there when our father died. A. still lived B. lived still C. was still living D. were still living 9. I ............................to New York three times this year. A. have been B. was C. were D. had been 10. I will come and see you before I ....................for America. A. leave B. will leave C. have left D. shall leave