Many of the artists who _______ didn’t come.
| A．ought to appear | B．should appear |
| C．had to appear | D．ought to have appeared |
Since most Antarctic rocks are dark in color, they stood out _____ the white background and are easy to identify and collect.
| A．against | B．on | C．beyond | D．above |
No sooner had I come to the office _____ the boss told me that I was fired.
| A．when | B．after | C．than | D．before |
Not only _____ a promise, but also _____ it.
| A．did he make; he kept | B．he made; he kept |
| C．does he make; does he keep | D．he has made; has he kept |
Have you adapted _____ in a different country?
| A．to living | B．to live | C．living | D．in living |
He won’t wear a hat _____.
| A．however cold it is | B．how cold it is |
| C．however it is cold | D．however cold is it |