8. Put the verbs in brackets into the appropriate tenses to form Type 1 conditional sentences. 1. If you use (use) less paper, you .......... (save) the rainforests. 2. The polar bear ...... (not/become) extinct if we ...... (stop) global warming. 3. You ...... (waste) electricity if you ...... (leave) your computer on standby. 4. ........ the ice caps ......... (melt) if temperatures ........ (rise)? 5. If you ..... (ride) your bike, you ........ (not/cause) air pollution. 6. We ........ (reduce) waste if we ......... (recycle) rubbish. 9. Rewrite the sentences. Use if or unless. 1. Unless we stop burning fossil fuels, global temperatures will rise. -> If we don't stop burning fossil fuels, global temperatures will rise. 2. If we don't help save the animals, they will become extinct. -> ...................................... 3. Unless we recycle more, we won't have a place for all the rubbish. -> ........................................

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