7) mustn't
8) mustn't
9)don't have to
10) mustn't
11) don't have to
12)don't have to
13) mustn't
14) mustn't
15) mustn't
16) don't have to
7) mustn't
8) mustn't
9)don't have to
10) mustn't
11) don't have to
12)don't have to
13) mustn't
14) mustn't
15) mustn't
16) don't have to