（ ）.Let’s now.
A. go B. goes C. going
What_____to trees in the different season ?
A. happen B. happens C. happened
_____is exercise .
A. Runing B. Running C. Run
_____do you play basketball ?Three times a week .
A. How long B.How often C. How many
Yesterday we____a pair of runners and a T-shirt for Li Ming .
A. buy B. bought C. is buying
Let’s ask the police officer ______some help .
A. for B. on C. to