------ What made you so sad?------ ______ my wallet.
If you want to _________ university, you should work hard.
The captain commanded that the mission ______ before dark.
The room is too small and it is not fit_________.
It’s her first time that she_______ by the school to participate in the contest.
It is the test system, ______ the teachers,that is to blame for the heavy burden of middle school students nowadays.