Stop _____,let’s listen to the teacher.

Here are three books on history．Which one would you like to borrow— ______. You see，I’m interested in geography these days.

It has been two and a half years _________ we left our primary school.

下列词语中加点字的读音，没有错误的一项是

The research on the new flu virus vaccine ischallenging and demanding. Who do you think can do thejob— ____ my students have a try