﹣How often do you have a school trip this term﹣_____．Since several accidents happened to some schools，all the school outdoor activities have been asked to stop．

My suggestion is that he________ an operation at once.

only too ready to help others, seldom, ______, refusing them when they turn to him.

Mom, you’ve bought the wrong shirt. It’s not the red one _____ the blue one.

下列各句中，没有语病的一句是（ ）