— Must I finish my homework now?— No, you _____.A. mustn’t B. needn’t C. can’t
—________she________doing her homework yet? —Yes,she has.She________it just now.
She has been in the city________.
Why don’t we consider________the Great Wall next weekend?
That clever boy regards the problems________challenges.
There are________people leaving the countryside to search________work in the city.