Is Mr. Green in the office?—No, he ________ be in the office. Look, the light in the office is off.

Look, Victor. This brown cat is ________ than that white one.—Yes. And it is _____ of all these cats.

The story _________ is not interesting, but why it has so many readers？

Tom, you’ll fail in the English exam if you don’t study hard. ______ it.

Tom, who taught Chinese before you came to China?－Nobody. I learned it by .