用 have to ,do not need to ,did not need to
1,I______buy both books so I bought only one
2,We_____hurry .We are very late
3,We _____hurry.There is plenty of time
4,He _____do any homework last night because he had finished it at school
5,You_____take a taxi .there is a bus cominp
6,She _____get up early yesterday becanse it was a holiday
7,You _____stay behind to help me with my work.I can do it by myself
8,I_____take a taxi .I can not wait for a bus
9,You ____write home because you are going home tomorrw
10,I_____buy any new shoes because my mother bought two pairs for me yesterday