People often have this belief _______ development is bad for the environment, but this does not have to be true.
| A．whether | B．what |
| C．that | D．how |
The population of China ________ 1.3 billion，and 80% of the population________farmers.
| A．are; is | B．is; is |
| C．is; are | D．are; are |
Every possible means ________ to prevent the air pollution，but the sky is still not very clear.
| A．were using | B．have used |
| C．has been used | D．was used |
It is reported that 40 percent of the land in Brazil________covered with trees.
| A．is | B．was | C．are | D．were |
Either the judge or the lawyers________wrong on the case at that moment.
| A．is | B．are |
| C．were | D．was |
The poet and ______ pianist is going to give us a talk this afternoon.
| A．an | B．a | C．the | D．/ |