They multiplied and filled the oceans and seas with oxygen, _____ encouraged the later development of early shellfish and all sorts of fish.
| A．that | B．where | C．when | D．which |
This time next week, we _______ a meeting in Beijing.
| A．will have | B．are going to have | C．will be having | D．are having |
Nowadays, more and more people are dedicated _____ the poor in the remote areas.
| A．to help | B．in helping | C．on helping | D．to helping |
The speaker always talked about difficult things. His ideas hardly _____ to the audience.
| A．got over | B．got through | C．got across | D．got down |
—Why are you standing here?
—I’m waiting for Shirley. She will be back _____.
| A．gradually | B．originally | C．shortly | D．abruptly |
By the year 2020 scientists _____ a lot of research on AIDS.
| A．had done | B．do | C．are doing | D．will have done |