—It seems that his health is improving.
—Yes. It is ten years ___ he _____.
| A．that, smoked | B．after, didn’t smoke | C．since, smoked | D．before, smoked |
I just wonder ____ that makes him so excited.
| A．why it does | B．what he does | C．how it is | D．what it is |
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.
| A．/; the | B．the; / | C．an; the | D．the; a |
The doctor must be _______ 24 hours a day, 7 days a week in the boarding school.
| A．on call | B．by hand | C．in sight | D．on spot |
What was considered impolite years ago has become ________now.
| A．accessible | B．adjustable | C．unbelievable | D．acceptable |
Which way do you enjoy _______ the coming winter holiday, staying home or going on a trip to Europe?
| A．spending | B．spend | C．to spend | D．to be spending |