1. -Need i walk quietly?
-Yes,you_____
a.may b.must c.can d.need
1. B need疑问句的肯定回答借助于yes,you must.否定回答为：no, you needn't.与must一般疑问句的回答完全一致.
-Is everyone here?
_No.Tom broke his leg and he is _____ now
a.in hospital b.in the hospital
2.A 表示住院用in hospital,中间没有冠词.而in the hospital只表示在医院里,但不一定住院.
-There is always ____traffic in this city.
a.little b.a little c.few d.a few
3. B traffic为不可数名词.排除C和D,因为一个城市不可能没有交通,排除A.答案为a little.