III Put the verbs in brackets into Conditionals I 1 If people ..(to stop) throwing rubbish into the seas and rivers, clean water... (not/to be) a problem. 2 If we ... recycle old magazines and books, we ..(to save) trees. 3 If you ...(to turn) off the lights when you leave a room, we ...(to reduce) the use of energy. 4 You...(to have) to wear a mask, if the air ...(not/to be) clean. 5 More species..(to survive), if we ...(to protect) nature. 6 We ... (to be thirsty),if we..(not/to have) enough water.

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