Which floor do you_______ this tall building?

Who taught ________ to write the computer program?—Nobody. She learned it by __________.

I don’t think it is teachers who ______ for giving students too much pressure.

Many students say that they are willing to work hard to get more education

Hello, Mike. Long time no see, Where are you?—Oh, not only my parent but also I __ Wuhan for a month.