--Wow! What ____ big supermarket! --Yes, it is. A. a B. an C. the
—May I _____your bike? ----Sorry.
There are twenty_____in our school. Some of them are____.
---____did she go to Beijing?---You won’t believe it! On foot.
--____will you come back? ----In an hour.
I ___the blackboard, but I can’t ______a word.