—Why did you plant so many trees?
— ______ the environment.

I saw him ______ the game on the computer yesterday evening.

My mother told me _______ junk food at school.

There 's a teacher  _____ with your parents in the teachers' office.

I never forget the days when I  enjoyed ______ a good time in Beijing.

We shall  never give up ______ for even one day.

Mr.Wang often asks us ________ in the class
A. not talk    B. not to talk   C. don’t talk

Today the weather is hot, so we decided __________.
A.go swimming
B. to go swimming
C. going swimming

The sad movie makes me ______.
A. cry     B. to cry  C. crying

My grandpa would like              the radio.
A. to listen    B.to listen to    C. listening to