改下列句子保持原意
问题描述：
改下列句子保持原意
1、What made him think so?
（ ）what was he made ( )think so?
2、Mother didn't let him go out last night.
He wasn't allowed ( )go out last night ( )her mother.
3、He made some money when he was in Aprica.
He made some money( ) his stay( )Africa.
答
By to
to by
during in