| A．We should drive more often. |
| B．We should throw rubbish into the rivers. |
| C．We should stop cutting down so many trees. |
( )| A．We should always go to work by car. |
| B．We should use bikes instead of cars. |
| A．flesh | B．fresh |
( )| A．We shouldn’t waste water. | B．We should waste water. |
| A．We shouldn’t litter. | B．We shouldn’t kill wild animals. | C．It’s 50 yuan. |
| A．plant | B．plants | C．planting |
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