Drinking more water is a good way to ______ the flu.A. prevent B. cause C. break
My father goes to work ______ every day.A. by a bikeB. in a bikeC. on a bike
She ____ back home once a year with her parents.A. is going B. go C. goes
Look, there is a boy over there _____ the tree.A. on B. in C. at
I usually walk to school, but I ______ come by bus.A. some times B. often C. sometimes
We can’t see ____ sun at night.A. a B. an C. the