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.