ответьте Today is my sister's birthday and the whole family is busy! Dad (1)(tidy up) the house and Mum (2)(prepare) the food for the party-it's all vegetarian because some of our guests (3)(not eat meat.It's a lot of work for Mum, but she really enjoys it. We always (4)(have) a party on Jane's birthday and on my birthday, of course! Jane's birthday isin the summer, so we usually (5)(go) to the park for a picnic in thesun, but this year she (6)(have) her party at home. It's going to belots of fun because it's a fancy dress party!​

The nature and the person are closely connected. And if the nature can exist without person, then the person without it can't. Therefore it is so important to live in harmony with the nature.
But, unfortunately, people try to subordinate to themselves the nature, to become her owner, but so it is impossible. The nature needs to be protected, it is our house. Necessary for life the nature gives all to us. If was considered earlier, the natural riches which aren't settled that they in large quantities, then now it becomes clear what is in limited quantity much. The person can't use gifts of the nature constantly as they can disappear soon. A task of the person to preserve the nature and to increase her riches. It is necessary to approach the matter as we are obliged to leave behind to the descendants the rich, beautiful, and pure planet responsibly.

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ALTERNATING CURRENT

Alternating current (AC) is an electric current which periodically reverses

direction, in contrast to direct current (DC) which flows only in one direction.

Alternating current is the form in which electric power is delivered to businesses

and residences, and it is the form of electrical energy that consumers typically use

when they plug kitchen appliances, televisions and electric lamps into a wall

socket. A common source of DC power is a battery cell in a flashlight. The

abbreviations AC and DC are often used to mean simply alternating and direct, as

when they modify current or voltage.

Тhe number of cycles per second is the frequency of an alternating current.

Тhere are two frequencies: the standard for Europe is 50 cycles per second while

the standard for the USA is 60 cycles per second. А standard frequency has а great

advantage since different systems сan bе interconnected.

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