Упражнение на as, when, while

Глаголы need, have to отличие
Ex. 1 As, while, when. Choose the right variant 1. ... they were thirteen they went to Warsaw.
2. Dick began to play the computer games......my mum left for work.
3.......I was painting the fence, Bob offered to help me.
4. The children cut themseves.......they were playing with the knives.
5. Take our keys under the door rug......you come home.

6.......the door opened we were brushing our teeth.
7. Does she remember.......my brother went boating in the White Lake with her sister.
8. My friend Carol was on a boating holiday in Canada.......she hurt her shoulder.
9. .......we tried to make them get up.
10. It became vividly that they were very ill.
11. My friends were still busy.......they hung up their mobilephones.
12. Nick and Mike fell down........they were running for their bus.
13. My wife and I were walking accross the field.........we tripped over.
14. We were bad at phisics......we were at the collage.
15. My mum can remember clearly.......she last met Steve.
16. My granny gets pain in her right foot.......she walks up the stairs.
17. ........he started the bus last night, the engine made a bad grating noises.
18. She'll find that it becomes easier.........she gradualy get better at her work. 
19. They went to Paris with us....... they were 20.
20. The baby began to smile ....... the doctor left the ward.
keys:
1. When, 2. as/when, 3 as/when/while (as=because). 4. as/when/while, 5. as/when, 6. When, 7. When, 8. When, 9. as/when, 10. as/when, 11. as/when/while, 12 When, 13 When, 14. When, 15. as/when, 16. when/as, 17. as, 18 as

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