Among all these books， of them are for children to read．（ ）
A．three fifthB．three fifths
C．threes fifth
Shall we ______ the things we don' t use to the people in need？
Good idea．（ ）
A．put offB．set outC．get intoD．give away
______ do you put a lot of snakes into the forest？
To protect the ecosystem．（ ）
A．WhyB．WhichC．HowD．When
Yang Ming， could you please teach me Chinese？
_______．（ ）
A．Not at allB．It is not a big deal
C．With pleasureD．That's all right
_______ do you exercise，Tony？
Three times a week．（ ）
A．How oftenB．How soonC．How longD．How much
Zhong Wei told his friends ________ to be back to his hometown．（ ）
A．how happy he isB．how happy he was
C．he is how happyD．he was how happy