-- Mom, when shall we go to Weifang Museum this weekend?-- Oh, sorry. I'm going to Beijing for a meeting. ___Saturday __ Sunday is OK.
ORBIS uses a flying eye hospital______________ poor countries, right?
Tom ______ go to bed late, but now he _______ to bed early.
I think _____________ necessary to do some morning exercises every day.
Don’t _____________ the disabled persons. We should help them.
It will be rainy, you’d better take_____ umbrella