—What's this _____ English? — It's ____ apple. A.in; the B.of ;an C.in;an
----We have a lot of cakes here.Help _____ to some more ,kids. ----Thank you.
Billy is so tired _____ he worked all night in his office.
We must stop _____down trees if we don’t want a world without them.
Are your parents strict_____ your school work ?
Alice and I often study and play_____ table tennis together.