Нужно в правильном времени поставить и еще с if и when. 1)if pollution (to disturb) the balance in nature all living things (not to live) in harmony. 2)if the air and the water are polluted. many species of plants and animals (to disappear) 3)we (to put) up a tent when we (to go) to the camp. 4)we (to go) camping we never (to make) campfires. 5)if we (not to pay) attention to pollution , our earth (not to be safe) to live in

1) disturbs 't live . 2) will disappear 3) shall put 4) go shall make 5) don 't pay 't be safe

4. that is desk.a.sue's  5. i like to the theatre.d.going  6. what time work? d.does he start  7. some books on the table.c.there are  8. have a sandwich? a.can i  9. i on holiday in august.c.usually go  10. i sometimes work saturdays.a.on  11. he swim very well.d.can't  12. i a nice statuette last week.d.bought  13. there is paper on the tablec.some  14. her brother is than me.b.taller  15. any sisters or brothers? a.do you have  16. she wearing glasses now.b.isn't  17. when to buy me a computer? a.are you going to  18. i to france.b.have never been  19. it was nice you.d.to meet  20. would you like to go the world? d.round  21. when she got back, the dog her lipstick.a.was chewing  22. she's youngest in the family.b.the  23. there a festival tomorrow.a. will be  24. why change your mind? d.did you have to  25. if i to the post office, i'll post this letter for you.c.go  26. i get up at 6 o'clock in the morning.a.didn't use to  27. when the radio a.was, invented  28. if i a lot of money, i would buy a house in the country.a.had  29. when i woke up, everybody else a.had already left  30. she said she his new car.a.liked  31. he ever since he arrived at the party. he's had eight beers so far.d.has been drinking32. after to manchester, the johnsons felt much better.c.having moved  33. she can't afford for her car.d.to pay  34. we been going out with each other for a year in september.c.will have35. if the water had been warmer yesterday, i gone swimming.b.would have  36. this time next month i lectures at a university.b.will be attending  37. i haven't got money. could you lend me c.any, some  38. it's not very easy to live d.on your own  39. money makes the world go round.  40. he thinks too much himself.c.of