There are some health problems that, when ____in time, can become bigger ones later on.
| A．not treated | B．not being treated |
| C．not to be treated | D．not having been treated |
— 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 |
I’m tired out．I stayed up the whole night, ______ for my midterm math exam．
| A．studying | B．to study | C．to be studying | D．studied |