| A．low-carbon | B．carbon-low | C．lower carbon |
| A．which | B．when | C．who |
| A．drink | B．to drink | C．drinking |
| A．turn; on | B．turn; up | C．turn; off |
| A．We can write on both sides of the paper. | B．Don't do homework. | C．We can plant many flowers. |
| A．also | B．water | C．TV |
| A．wait | B．when | C．where |
| A．always | B．often | C．crayon |
| A．hour | B．talk | C．save |
| A．wash | B．teeth | C．leg |
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