B 1.You don't need to arrive half an hour early
2.You mustn't arrive late
3.Small vehicle don't need to wait
4.Drivers of large vehicles mustn't cross alone
5.Students mustn't make a noise
6.Third-year students don't have to take the exam
7.You mustn't talk in library
8.You don't need to put the books back on the shelves
9.Swimmers don't need to pay today
10.Swimmers mustn't eat or drink by the pool
C Mark:We have to get up early tommorow
Bob:Why?
Mark:Have you forgotten?Angela has to move to a new flat tommorow,and I promised we could help her
Bob:Does she have to move out by a particular time?
Mark:No,there's no rush.She doesn't have to leave her old flat before the afternoon,but there are lots of things that she has to pack,so we must get there fairy early.
Bob: Why does she have to move,by the way?
Mark:She said that I mustn't tell you because she wants to tell you herself when she sees you tommorow
Good luck,and I hope I did good ;)
