-Do you know if he will come tomorrow?-No,but if he ,I’ll call you to have a meal together.
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.