Complete the sentences using while. Follow the model on page 13.
Danger of an electric shock disappears when the faulty parts earthed .

One should work on the circuit when the power is off. One should work on the circuit when the power is .

Contact with dead conductors is safe ... .

In dry air the risk of an electric shock decreases ... .

i sometimes buy a 1pack of crips and a 2 cans  of cola on my way back from school. then, when i get home, i usually have a 3 cups  of tea and a 4 pieces  of my granny's fruitcake.

1)  london wasn't the capital till the eleventh century. - london didn't used to be the capital till the 11th century. 

2)   when willian shakespeare lived in london he acted and wrote plays. -  when w.s. used to live in london, he acted and wrote plays.

3) henry longfelow , one of the most popular american poets of the 19-th century , learnt modern languages. -  h.l., one of the most popular american poets of the 19th century, used to learn modern languages.

4)   when michel jackson was 7 years old he often took part in the concerts. -  when m.j. was 7 years old, he often used to take part in the concerts.

almost all people are fond of travelling. it is very interesting to see new places, another towns and countries. people may travel either for pleasure or on business. there are various means of travelling. for me there is nothing like travel by air; it is more comfortable, more convenient and, of course, far quicker than any other means. there is none of the dust and dirt of a railway or car journey, none of the trouble of changing from train to steamer and then to another train.

with a train you have speed, comfort and pleasure combined. from the comfortable seat of a railway carriage you have a splendid view of the whole countryside. if you are hungry, you can have a meal in the dining-car; and if a journey is a long one you can have a wonderful bed in a sleeper.

travelling by ship is also very popular now. it is very pleasant to feel the deck of the ship under the feet, to see the rise and fall of the waves, to feel the fresh sea wind blowing in the face and hear the cry of the seagulls.

many people like to travel by car. it is interesting too, because you can see many sights in a short time, you can stop when and where you like, you do not have to buy tickets or carry your suitcases.

a very popular means of travelling is hiking. it is travelling on foot. walking tours are very interesting. hitch-hiking is a very popular method of travelling among young people. but it is not as popular in our country as abroad.

can i play with you?

yes, of courыe,you can play with me.

should we do it?

yes, we should do it.

must we translate this text?

yes, we must translate this text.

may she take his pen?

  yes, she may take his pen.