31.You -----return the book now.You can keep it until next w

31.You _C____return the book now.You can keep it until next week.（94广东）
A..can't B.mustn't C.needn't
你没有必要现在就还书,你可以保存到下周.根据句意,应该选不需要needn't
32.You are very ill,so you ____C___ stay in bed for a week.（98广东）
A.Can B.need C.must
你病得很严重,所以你必须卧床一周.这里可以选need 也可以选must 但是后面是动词原型 而不是不定式 所以只能选must
33.I'll give the letter to her A_______ she comes back.（2000茂名）
A..as soon as B.before C.since
她一回来我就会把信给她.as soon as一.就.
Tom was born ___C___ May 3rd,1985.（2000广东） A..in B.at C.on
具体日期（一天）用on
34.Can you let me __A______home a little earlier?(97广东)
A..go B.going C.to go
let sb do sth
35.The teacher told us _A________ in the street.（96广东）
A..not to play B.not play C.don't play
tell sb (not) to do sth