–I think Mr Zhang may be in his office.--No, he be there. I saw him just now.A. needn’t, left B. mustn’t, leavingC. can’t, leave C. shouldn’t, leave
—I had a bad cold. —________.
—Will you have a picnic tomorrow? —Yes.But if it________,we’ll visit the museum instead. A.will rain B.rains C.doesn’t rain
The river will be dirtier and dirtier________we do nothing to protect them.
—________ —I have a fever.
—Mum,I have a cold. —You________go to a doctor.I’ll take you to hospital.