Chọn đáp án thích hợp vào chỗ trống, hoàn thành câu

1. They.........tomorrow at 12:30
A.will leave      b. are leaving      c. are going to leave     d. leave
2. Someone.............at the door, can you answer it?
a.knocks           b. is knocking         c. has knocked     d. knocked
3. John..........at the moment , so he can't answer the telephone 
a.works     b. is working     c.has worked      d. will worrk
4. The river............after last night's rain
a. flowed          b. flows     c. is flowing      d. wil flow
5. he................ for Chelsea this season
a. played          b. is playing       c. would play        d. has played