Shall I go and buy two more bottles of beer?— No, I’ve already bought twenty. That _____ be enough for us two.

下列各句中，没有语病的一句是（ ）

I’m sorry to keep you ______ for an hour. Now let’s begin our work.

The students are so ___ to watch such an ____ movie .

Be sure to get there on time, _____ you? — Of course, we _____.