— How did he finish he work?
—I heard that he did it _________.
| A．of himself | B．on the own |
| C．of his own | D．by himself |
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