Complete the sentences about the possible future for our word,using a suitable form of the verb in brackets,depending on whether you think the sentence describes something real/possible or unreal/impossible.
1) If we (recycle)....... more household waste,there (be)....... less damage to the environment .
2) If the earth (stop)......... spinning one side (always be)....... in darkness.
3) If the polar ice-cap (melt)....... completely sea levels worldwide (rise)......... by about 60 metres.
4) If an astronaut (fall)....... into a black hole in space ,what(happen)..........?
5) If people (not stop)........... using cars so much the country's road (eventually grind)............ to a standstill.
6) What (happen)............ when the world's supplies of oil (run out).............?
7) If human beings (finally start)........... living on the moon,they (need)........... to produce water artificially.
8) If there (not be).............. any money (the world be)............ a better place?
9) If we (not stop)................. over-fishing the world's oceans,many species (become)............... extinct.
10) If everyone in the world (jump).......... up and down at the same time,there(be)..............no measuarable effect ( apart from 6.5 billion footprints).
