Over a hundred people must have been driven away.( )they were.填I think .还是 I am sure

题目

Over a hundred people must have been driven away.( )they were.填I think .还是 I am sure
请帮忙翻译：1.抚养费
2.Whatever make you think of such a thing.
3.He should be instructed in his duties.

答案

I am sure.
1.alimony
2.究竟是什么事使你想到了这件事.
3.应当教育他自己觉尽责.