Chọn thì thích hợp nhất để hoàn thành các câu sau: 14. I ______ TV while my father ______ a newspaper last night. A. am watching / was reading B. was watching / was reading C. am watching / is reading D. was watching / is reading 15. Peter _____________ at the moment, so he can't answer the phone. A. has worked B. is working C. worked D. works 16. Don't go anywhere until I ______ back. A. came B. have come C. come D. will come 17. She didn't tell me the reason why she ______ to school the day before. A. didn't come B. hadn't come C. wouldn't come D. doesn't come 18. The house caught fire while they ____________. A. are sleeping B. have slept C. were sleeping D. sleep