—Can we leave the classroom now? —No,you .You to leave until the bell rings. A. don’t have to; are supposed B. mustn’t; are allowed C. needn’t; aren’t allowed D. can’t; aren’t supposed 2. —I have sore eyes. —You play computer games too long. A. must B. shouldn’t C. had better D. don’t 3. —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; leaving C. can’t; leave D. shouldn’t; leave 4. —John, do you have any plans for this weekend? —I’m not sure. I go fishing with my uncle. A. can’t B. may C. must D. should 5.With the help of the smart phones, you video chat with your friends on the phone. A. can B. must C. need D. should