If there are people driving, there will be air pollution.
A、more, less
B、fewer, more
C、fewer, less
Mr. Li ____ to give a talk in our school yesterday.
| A．invites | B．is invited | C．was invited | D．invited |
The boys ____ a football match tomorrow morning.
| A．are having | B．will have | C．had | D．have had |
When the teacher came into the classroom, the students ____ in groups.
| A．work | B．have worked | C．were working | D．are working |
In 2000, we ____ to the Great Wall and had a good time there.
| A．go | B．went | C．will go | D．have gone |
Frank asked his father ____ a new bike for him and his father said OK.
| A．buy | B．to buy | C．buying | D．bought |