Young as he is, David has gained ____ rich experience in ____ society.
| A．the; the | B．a; 不填 | C．不填；不填 | D．不填；the |
---Have you ____ some new ideas?
---Yeah. I’ll tell you later.
| A．come about | B．come up with | C．come into | D．come out with |
He suggested that she ____ the coat at home.
| A．leaves | B．left | C．leave | D．will leave |
What great trouble we had ____ where his house was.
| A．in finding | B．to find | C．find | D．found. |
Not until I began to work ______ how much time I had wasted.
| A．didn't I realize | B．did I realize |
| C．I didn't realize | D．I realize |
Unless ___ to speak, you should remain silent at the conference.
| A．invited | B．inviting | C．being invited | D．having invited |