Short skirts ______a few years ago, but they have come back again. 

One of the greatest benefits of stamp－collecting is that they are based on common interests，________ appearance，age or wealth.

Modern science and technology has __________ communication between people far apart.

— How long have you been here?— Only about five minutes. Henry and Simon ______ here with me.

The officer ordered the policeman to __________ that tall man in a black hat. He thought the man might be the murderer wanted.