---Lisa ,hurry up !The bus is coming .--Oh ,no . We______cross the street until the traffic lights turn green .A. mustn’t B. needn’t C. should
Beijing is one of the _________________ in the world today .
I don’t know if he __________ tomorrow . If he _______ here , I will call you .
Can you __________________ other ways to solve this problem?
There used to be a hospital , __________?
Could you ____ me ___ some information about student exchange programs?