— People should spare no efforts to protect the environment.
— ________. Air pollution does harm to our health.
| A．All right | B．Take it easy | C．Go ahead | D．Exactly |
. I must go now. _____, if you want that book I'll bring it next time.
| A．Incidentally | B．Accidentally |
| C．Occasionally | D．Subsequently |
Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____ without scientific basis.
| A．process | B．practice | C．procedure | D．program |
They were so far away that I couldn't _____ their faces clearly.
| A．see through | B．make up | C．see off | D．make out |
If the boy had _____ the dog alone it wouldn't have bitten him.
| A．set | B．left | C．had | D．put |
The generation _____ makes it difficult for parents to understand their children's opinions.
| A．division | B．gap | C．separation | D．interval |