Điền từ thích hợp vào chỗ trống:

1 .......the children (play).........in the park at the momoment?
- No, they aren't. They (learn)..........to play the piano
2 .........your friends (be)..........students? - yes, they (be)..........
3 what............your mother (do).........at this titime?
- She (make).............a dress
4 the students (not be).............in class at presenpresent
5 I (do)...............an exercise on the present tenses at this moment and I (think)...........that I (know)...........how to use it now
6 my mother sometimes (buy)...........vegetables at this market