— What do you think of your English teacher?— He is friendly to us although sometimes he looks .A. happy B. kind C. serious
Liang Li always helps others _____ she is very busy.
None of us _____ running, but we all like swimming.
—Is _____ ready for the trip? —No, we haven’t got a camera.
The cleaners must keep the street _____.
We must plant more trees after we _____ every year.