1whose camera is this? is it ..yours. ? (you) 2 excuse me, those are , .our.. seats, (we) 3 is it suitcase or ? (you/he) 4 has the dog had food? (it) 5 they're not keys - they're (i/she) 6 i don't think its room: i think it's (you/they) 7 the police asked me for address. (i) 8 have you got pen, or would you like to borrow? (you/i) 9 garden is bigger than (they/we) 10 i think this is book. oh no, it's (i/you) 11 the decision is (they) 12 the cat wants dinner, (it) 13 you know it's not money. it's (you/i) 14 it isn't car, it's (he/she) 15 it wasn't mistake, it was (i/they) 16 have you met mother? (they) 17 parents say the decision is (she/they) 18 brother hasn't got a phone, so he uses (i/we) 19 car wasn't working, so i used (i/he) 20 house is smaller than (we/they) unit 4

1. to be fully effective control must start with the production of raw materials. 2. metals dо not melt until being heated to a definite temperature. 3. to give a true picture of a surrounding matter is the true task of natural sciences. 4. this paper aims at acquainting the readers with modern achievements in machine-building. 5. the problem to be considered next is connected with microcomputers. 1. чтобы быть полностью эффективным, контроль должен начинаться с производства сырья. 2. металлы не плавятся, пока они не нагреты до определенной температуры. 3. истинная естественных наук - дать верное описание окружающей материи. 4. данный труд предназначен для ознакомления читателей с современными достижениями в машиностроении. 5. , которую предстоит рассмотреть сейчас, связана с микроэвм.

2. water covers most of the earth's surface.

3. most of the earth's surface is covered by water.

4. the park gates  are locked  at 6.30 p.m. every evening

5. the letter  was posted  a week ago and it  arrived yesterday.

6. the boat  sank  quickly but fortunately everybody  was rescued.

7. ron's parents died when he was very young. he and his sister  were brought  up by their grandparents.

8. i was born in london but  grew up in the north of england.

9. while i was on holiday, my camera  was stolen from my hotel room.

10. while i was on holiday, my camera  disappeared from my hotel room.

11. why did   sue resign    from her job? didn't she enjoy it?

12. why was bill sacked from his job? what did he do wrong?

13. the company is not independent. it  is owned  by a much larger company.

14. i saw an accident last night. somebody  called an ambulance but nobody  was injured  so the ambulance  was not needed 

15. where  were these photographs  taken ?   in london? did you take them?