I. Choose the best answer to complete the sentence 1. You_____ pick those flowers. Don't you see the sign A. mustn't. B. don't need to. C. can't. D. needn't 2. It's late. I think we____ better họ now A. had B. have. C. should D. would 3. We_____ take a bus to the school. It's too far to walk A. have to. B. had C. may. D. ought