( )1.Niagara Falls is in _____.
A.the UK B.China C.Canada
( )2.Hi Tim!Here is a letter____ you.IT's ____beijing.
A.for;from B.to;from C.for;of
( )3.Some animals were ____ in the daytime and ___ at night.
A.sleep;wake B.asleep;wake C.asleep;awake.