We can have ________ bluer sky if we create _________less polluted world.
| A．a; a | B．a; the |
| C．the; a | D．the; the |
The boy stopped ___TV and went to do his homework when his mother came back.
A. watch B. watching C. to watch
Math is _____ difficult for some students _____ learn.
A. too, to B. enough, to C. much, to
I was ______ when I heard the ______ news.
A. exciting, exciting
B. excited, excited
C. excited, exciting
—______ handsome boy he is!
—Yes, you are right.
A. What a B. How a C. What
—Jane ,can you play_______ erhu .
This is ______ useful book on erhu .
A. the , a B. / ; aC. the ; an