Thomas Edison is known _____inventions______ a great inventor.
| A．to, as | B．for , as |
| C．as, to | D．to, for |
The flowers smell ______.
A. well B. badly C. good
Mrs. Smith has _____ son and a daughter.
A. a B. an C. the
Bob is _________ than John.
A. tall B. taller C. tallest
—What are _______ teachers doing?
—They are having a meeting.
A. this B. that C. those
There are a lot _____ students on the playground.
A. of B. in C. by