—I wonder how much you charge for your services.
—The first two are free ________ the third costs $30.
| A．while | B．until |
| C．when | D．before |
16. He had already learned the news. I ______ the trouble to phone him about it.
| A．needn't have taken | B．could have taken |
| C．should have taken | D．mustn't have taken |
15. The managers discussed the plan that they would like to see ______ the next year.
| A．carrying out | B．carried out | C．carry out | D．to carry out |
14. --- It’s thirty years since we last met.
--- But I still remember the story, believe it or not, ______ we got lost on a rainy night.
| A．which | B．what | C．that | D．When |
13. ___ had they reached the 30th floor ____ they realized that they had forgotten to take the key.
| A．Hardly; than | B．Hardly; when | C．No sooner; when | D．No sooner; then |
12. Bungee is an adventurous sport, popular with young adults, ______ courage matters more than strength.
| A．where | B．that | C．of which | D．whose |