One reason Crystal has become so famous is that he is very quick thinking, and is often able to _____ new jokes about the people and things around him.

The teacher suggests ____________ speaking English as often as possible .

It’s obvious that getting these historic sites recognized by the world is helpful for preserving and repairing them，as it________ their extreme importance and value.

Our team _______ five persons.

May I visit you at 10 o’clock tomorrow morning?— I’m afraid I ______ a document for my boss thenWhat about 12:00?