More and more people have a low-C life and the air is getting much ___ than a few years ago.
| A．clean | B．cleanest |
| C．cleaner | D．the cleanest |
A number of students _______ reading in the classroom now.
| A．is | B．was | C．are | D．were |
Jack Chan is very modest. He never _______.
| A．shows off | B．shows on | C．show off | D．show on |
I am so _____ when I heard the ________ news.
| A．excited; excited | B．excited; exciting | C．exciting; exciting | D．exciting; excited |
________ is difficult if you put your heart into it.
| A．Anything | B．Nothing | C．Something | D．Everything |
The man became a famous writer when he was ________.
| A．in his fifty | B．in his fifties | C．in fifty years old | D．in fifties |