American Indians ________ about five percent of the U.S. population .
| A．fill up | B．bring up | C．make up | D．set up |
— How can I wake up so early?
— Set the alarm at 5 o’clock, you’ll make it.
| A．but | B．or | C．and | D．so |
Tom _________ in the library every night over the last three months.
| A．works | B．worked | C．has been working | D．had been working |
Although cats can not see in complete darkness, their eyes are much more _______to light than human eyes.
| A．brilliant | B．attractive |
| C．available | D．sensitive |
There’re more than 100 elements found in nature, ______ are metals.
| A．most of which | B．most of them | C．most of that | D．most which |
— Tony，you look upset. What’s the matter？
— I had my proposal _______ again.
| A．turned over | B．turned on | C．turned off | D．turned down |