So desperate ______ that no one could help another, each ____ to save himself and his animals.

The rich man is very kind and helpful to the people ______ have difficulties.

The space suits can be adjusted so that the team can reproduce different levels of gravity as if they________in space

下列各句中，没有语病的一项是（ ）

He always did well at school ______ having to do part-time jobs every now and then