Грамматики
17. Underline the correct variant.
1) The tigress was still looking for her cubs a week after they had been
disappeared / had disappeared.
2) This chess championship of the "giants" is being / is watched very closely.
3) You are being / have been warned!
4) Is the seat taken? / Has the seat been taken?
5) The system will be / will have been fully tested by tomorrow morning.
6) A new power plant has been /is being built causing concern of the
environmentalists.
7) The book was not published until every small detail had been / taas checked.
8) The police found that the wax seal on the jeweller's box was / had been broken,
9) The Olympic stadium will be have been constructed using modern technologies.
10) This human error could be / have been avoided.
11) The car was / had been invented right before the XX century.
12) This book was has been written in English.
19. Use the verbs in brackets in either Active Voice or Passive Voice. Black holes are some of the strangest things in space. A black hole 1) (to suck) in anything that gets by. Nothing escapes from a black hole. Not even light. Everything 2) (to pull) together. The reason is gravity. Gravity is a force that pulls one thing to another. Gravity is the force that 3) (to hold) you down on Earth. When you jump up, you 4) (to draw) back by gravity. The Moon 5) ＿ (to make) to orbit Earth by gravity. The more matter 6) (to pack) in a star, planet, moon, or other object, the stronger is its gravity. Gravity makes an object with more matter 7) (to pull) an object with less matter toward it. The Sun's gravity pulls on itself our Earth. The Sun 8) ＿ (to orbit) by Earth. The matter that makes up an iron ball 9) (to compress) much tighter than the matter that makes up a bag of feathers. A lot of matter 10) (to go) into a black hole. Astronomers and physicists think black holes 11) (to bear) from dying stars. Under the force of gravitation the star 12) (to make) denser and denser to turn into a black hole.

объяснение:

winter holidays are shorter than summer ones. they begin at the end of december and last about two weeks. it is so nice to have a rest from school.

during winter holidays we celebrate the new year’s eve and christmas. there are new year parties for children at schools and theatres. cinemas show children films and cartoons.

it is usually very cold in winter, but frost and snow can’t keep children indoors. it’s so great to go skiing down a hill. boys like to play hockey on the ice. many children go to the skating-rinks to skate. small children play snowballs and make snowmen, or ride on the sledges happily.

when the weather is bad, i stay at home and watch tv. there is always something interesting on during winter holidays. sometimes my friends come to see me and we play computer games or listen to music. there is also more time for reading, drawing, making model planes and other hobbies.

holidays pass quickly and soon it’s time to go to school again.

перевод

зимние каникулы короче, чем летние. они начинаются в конце декабря и продолжаются около двух недель. это так приятно отдохнуть от школы.

во время зимних каникул мы празднуем новый год и рождество. в школах и театрах проходят новогодние елки для детей. кинотеатры показывают детям и мультипликационные фильмы.

зимой обычно холодной, но мороз и снег не может держать детей в помещении. ведь это так здорово покататься на горных лыжах. мальчики любят играть в хоккей на льду. многие дети ходят на катки кататься на коньках. маленькие дети играют в снежки и лепят снеговиков или весело катаются на санях.

когда погода плохая, я сижу дома и смотрю телевизор. во время зимних каникул всегда показывают что-то интересное. иногда мои друзья приходят ко мне и мы играем в компьютерные игры или слушаем музыку. существует также больше времени для чтения, рисования, изготовления моделей самолетов и других увлечений.

каникулы проходят быстро и скоро пора идти в школу.

1. my wife plum cakes. a) often does 2) this (stop) rain yet? a) has stopped. 3 “if i had any instructions, i would know what to do,” the mage said. d). the magician said that if she had any instructions, she would know what to do. 4. to learn english, you can take courses or visit an english-speaking country. a) either 5. the bird was absent. in the air it was but a pair of wings. a) something 6. i cannot give them the information they want. a) still 7. captain black sent a plane to west, over the pacific ocean. a) -, a, the, 8. your son passed the exam if he tried. b) may 9. with the invention of pneumatic tools, many problems of technology d) solved 10. the speaker made such a good speech that i could not resist loudly when he finished. c) applaud