A: Hangzhou is really a beautiful city and there’re many places of interest.B: I think so, why not stay here for _______ two days

People in ancient times ______ series of important events so that we now have what is called history.[ ]

下列各句中，没有语病的一句是

It seemed that the boy who you _____ didn’t show anyinterest in what he was reading at all

You’d better leave the key at home __________ one of us should think of coming back.—Why? Is your key lost? [ ]