—Your pencil case is very nice.
—________.
| A．Thank you | B．Excuse me | C．Yes, it is. | D．No, it isn’t |
Jack felt nervous when he found the physics problems ____ to work out.
| A．easy enough | B．too easy |
| C．too difficult | D．difficult enough |
Only 16 percent of China’s area ____ covered with forests, so ____of us should protect trees.
| A．are; every | B．is; each | C．is; everyone | D．are; each |
As a member of the Wild Animals Club, he ____ buys furs.
| A．usually | B．sometimes | C．often | D．never |
If nobody ____ the traffic rule, the Chinese style of crossing the road ____.
| A．will break; disappears | B．breaks; disappears |
| C．breaks; will disappear | D．will break; will disappear |
Breakfast is ready, you’d better____.
| A．not wake him up | B．not to wake him up |
| C．to wake him up | D．wake him up |