It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
| A．process | B．attention | C．measure | D．part |
Scarcely had they settled themselves in their seats in the theatre ______ the curtain went up.
| A．then | B．before | C．when | D．then |
What you told me the other day is really true,_______?
| A．isn’t it | B．isn’t what | C．didn’t you | D．wasn’t it |
The happiest of people don’t ______ have the best of everything; they just make the most of everything that comes along their way.
| A．simple | B．necessarily | C．actually | D．normally |
China’s population is expected to increase to about 1.5 billion in 2040, _____ it will start to decline slowly.
| A．where | B．which | C．after which | D．on which |
I have visited a lot of different places and stayed in lots of different hotels, but none of them _____ this one.
| A．makes | B．beats | C．compares | D．Matches |