下列各句中，没有语病的一句是（ ）

Whether at school or at home, children should be encouraged to read books and ______ what may be useful to their study.

It was getting harder and harder ___ money for the poor kids, because the price(物价) kept_____,

This is not___ watch. I think it’s ___watch.

下列各组词语中，没有错别字的一组是（ ）