—What do you think we can do for our aged parents? —You do anything except that you visit them as often as possible. don’t have to B. oughtn’t to C. mustn’t D. shouldn’t
The book ___ three yuan, but it only ___ me two yuan.
The building is ___.
He ___ go to work by bus, but now he ___ riding a bicycle to work.
I don’t feel like ___ now.I’d prefer ___ my homework at present.
---What ____ the population of China ? ---China has a population of 1.3 ____.