The math problem is ________for him to work out . He isn’t good at math.
My father goes to work ______ every day. A. by a bike B. in a bike C. 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