二、单项选择（本题有10小题，每小题1分，共10分。）
请从A、B、C、D四个选项中选出可以填入空白处的最佳选项。
( ) 16. Children are supposed to enter into this cinema with _______ adult.
A. a B. an C. the D. /
( )17. —Is that Shelly in the bedroom?
—-No, she _______be there. She has gone to school.
A. won’t B. needn’t C. can’t D. mustn’t
