--Are you going to buy a new camera?--Yes. But there are so many cameras that I can't decide__A. how to use B. where to sell C. which to buy
—What did our geography teacher say? —She told us that the earth _____ around the sun.
—Lily, _____ you _____ your ticket? —Not yet!
We couldn’t wait _______ a good rest after the exam.
Although we’ve learned English for years, we have trouble _____ the foreigners.
-----How many students are there in the classroom?------_______.