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As the population changed and grew, as agriculture developed and the need for timber increased, the forest areas gradually disappeared.

Areas with no source of electricity remain in darkness until the
comes up, because street lights need a power supply. British firms offer new appliances, such as solar-powered street lights. They work by using energy accumulated during the day from a solar panel. The batteries are being charged during the day and then it's power is used for lighting. The system can be used for one individual light or a number of them. In the south of Saudi Arabia a motorway tunnel miles from any power supply is lit day and night by solar-powered devices. The advantages of sun-powered lamps are
that they can bring light to areas distant from any other power supply and that they do not pollute the environment.

1.Form past simple question (?).When / you / go / to bed?

A)When did you go to bed?

2. Form past simple question (?).you / play / volleyball / yesterday?

C)Did you play volleyball yesterday?

3.Make the sentence negative (-) in the past simple. We had breakfast this morning.

B)We didn’t have breakfast this morning.

4. Make the sentence negative (-) in the past simple. She knew the answer to the question.

A)She didn’t know the answer to the question.

5.Complete the sentences. Use the verbs in brackets and write affirmative(+) sentences in the past simple. Amy (eat) a lot before she went to school.

B)Amy ate a lot before she went to school.

6.Complete the sentences. Use the verbs in brackets and write affirmative(+) sentences in the past simple. I (meet) Simon at the drama competition.

A) I met Simon at the drama competition.

7.Write the past simple forms of these verbs.

Go, know, watch, buy, travel

B)went, knew, watched, bought, travelled