Safety in school has been of great concern because of the frequent reports ____ students got injured or killed while in school.

下列各句中，没有语病的一句是（ ）

g arrangements are already __________, with which the scientists can go on with the further research.

The twins, who ______ their homework, were allowed to play badminton outside.

The teacher called Tom to his office because he wascaught ______ in the exam