1.what are you doing boys?the teacher asked with (interest).
因为在这里interest是名词,ing形式和ed形式都不能用
2.He is old enough to go to school(变为复合句）
He is so old that he could go to school.
3.Don't take away his things without (permit).允许的意思.
4.she is studying carefully.please don't （bother) her .(打扰）
5.考虑中.
6.I'd take a long walk before （going) to bed .
7.the first kind (is made up of) the first letters of other words(由.组成）
8.I would like to be a teacher (rather then) a teacher.
9.The girl standing under the tall tree is my friend’s sister .定语
成：Which girl is your friend's sister?
可是我一点一点打出来的哦,加油.