Thomas ________ the army for two years,so he misses his mother very much. A.has joined B.has taken part in C.has been in
The teachers _________ the office for a few minutes when we arrived.
---Mum,_______ I watch TV? ---No. Unless your homework _______________.
__________terrible luck he had yesterday!
Yesterday I met Jim. We ____________ each other since we _________ middle school.
---When did you return to China?---_________________.