The importance of saving gas_______be stressed too much. Automobiles use up some 70 billion gallons of gas a year.
| A．can’t | B．mustn’t | C．shouldn’t | D．may not |
—How much do you know about the 3D film technology?
—A little. Not until _______ the hot movie Avatar _______ something about it.
| A．did I see; did I begin to learn | B．I saw; did I begin to learn |
| C．I saw; I began to learn | D．did I see; I began to learn |
— 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 |
Mr. Smith didn’t understand _____ made his son so upset that evening.
| A．what was it | B．why it was this | C．how that was | D．what it was that |
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 |
Don’t mention that at the beginning of the story, or it may _______ the shocking ending.
| A．give out | B．give away | C．give up | D．give off |