— Do you smoke?
— No, I don’t. But I used to. It’s 20 years since I ______.
| A．didn’t smoke | B．have smoked | C．smoked | D．began to smoke |
--- You don’t seem to enjoy your meal very much.
----- Not really, I’m just______.
| A．on diets | B．on a diet | C．on the diet | D．in a diet |
A completely new situation is likely to _____ when the school leaving age is raised to 16.
| A．arouse | B．rise | C．arise | D．abide |
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 |