Rain forests ___________________(to disappear) nowadays.People have ________________(to destroy) a lot of wildlife.They ________________ (to collect) the litter at the seaside last month.We must _______________(to pay attention to) these problems as soon as possible.We are happy to ____________(to survive) on the earth.The children _____________(to water) the trees by the moment it got dark.I ________________(to walk) on the beach when I saw a big jelly fish.Our problems _______________(not to disappear) in future.

1) disappear2) have to destroy 3) collected 4) must pay attention 5) survive 6) would water 7) was walking 8) won’t disappear