Scientists thousands of chemicals before they decided on the right one in the end .
| A．tried out |
| B．found out |
| C．worked out |
| D．turned out |
What’s wrong? You see it’s the fourth time that Jenny _________you today.
| A．rings | B．had rung |
| C．has rung | D．rang |
You’d better _______his name, address and telephone number before you forget them.
| A．put off | B．care about |
| C．set up | D．set down |
I’d like to know _________ Chinese.
| A．when he began to learn |
| B．where did he begin to learn |
| C．when did he begin learning |
| D．for how long he begins to learn |
—Do you mean that we have lost our way?
—_________!
| A．All right | B．No problem |
| C．Certainly | D．Exactly |
— Jenny, it seemed that your partner didn’t dance well.
— Oh, _____Three boys to choose from and I picked the stupid one.
| A．you can’t be serious! | B．couldn’t be better. |
| C．don’t mention it. | D．just my luck! |