--- Did you find the pen yesterday?
--- No, I didn’t find ________, but I have bought ________.
| A．it; it | B．one; it | C．it; one | D．one; one |
Can you show me a case ____ the professor mentioned yesterday?
| A．when | B．where | C．that | D．what |
“Never for a second,” the boy says, “____ that my father would come to my rescue.”
| A．I doubted | B．do I doubt |
| C．I have doubted | D．did I doubt |
_____________ the sun for too much time will do great harm to your skin.
| A．Exposed to | B．Being exposed to |
| C．Exposing to | D．To expose to |
You should study the details of the policy________ before you sign it.
| A．in return | B．ahead of schedule |
| C．right away | D．on purpose |
Trees are good for man. We can’t plant them ______ many.
| A．so | B．such | C．too | D．enough |