—What you when I called you yesterday? —I was doing my homework. A.do, do B.did, do C.were, doing
We won’t go to the Great Wall until the rain _______.
I will give the message to him __________he comes back.
We won’t go to the Great Wall if it ___________ the day after tomorrow.
---What do you think Sam ________ in 10 years? ---A doctor.
Does he often _____ with your brother?