If we can convince young people _____, they might then urge their parents and other people ____ smoking, too.

I was ashamed _________ lied to my mother.

A lunar probe-Chang’e-2_______ as much as 2 tons was sent up into space on October12010.

 ---Do you feel like ____ out? ---No. I’d rather we _______ a taxi.

To succeed in a scientific experiment _____ .