Поделитесь своими знаниями, ответьте на вопрос:
1. A smokejumper’s job is ………. than an artist’s. a) dangerous b) the most dangerous c) more dangerous 2. How often ………. To the gym? a) you go b) are you going c) do you go 3. Mike ……… nervous whenever he goes for a job interview. a) is feeling b) feels c) feel 4. They were tired because they ………. well the night before. a) weren’t sleeping b) hadn’t been sleeping c) hadn’t sleep 5. Kate ………. play the flute as a child. a) used to b) uses c) use to 6. Jan ………. all day and the kitchen smelt wonderful. a) had been baking b) baked c) had baked 7. My flight to Paris ………. at 7:00 am tomorrow morning. a) will leave b) leaves c) is leaving 8. If Nigel ………. a lifejacket, he would have drowned. a) won’t wear b) didn’t wear c) hadn’t worn 9. Unless you ………. protective clothing, you can’t go volcano surfing. a) don’t wear b) will wear c) wear 10. 2008 was the year ………. I passed my driving test. a) where b) which c) when 11. ………. you tell her the truth or I will. a) Either b) Neither c) Both 12. Some honey ………. help your sore throat. a) may b) has to c) must 13. Derek ………. study abroad next year, but he isn’t sure. a) can’t b) might c) must 14. Penny hates ………. to classical music. a) to listening b) listen c) listening 15. Lyn has lived in Mexico ………. she was eight. a) for b) since c) ever 16. He caught the vandal ………. . a) itself b) herself c) himself 17. The police officer ………. the man he was going to prison. a) asked b) told c) said 18. The stolen painting ………. yet. a) wasn’t recovered b) hasn’t been recovered c) isn’t recovered 19. ………. are animals that are not dangerous at all. a) Deer b) Deers c) Dear 20. Nobody went out because of the ………. . a) bad climate b) fine weather c) nasty weather 21. How’s the novel? a) It’s a love story. b) It’s really bored. c) It’s really boring. 22. I work for a small clothes company as a ………. . a) nurse b) designer c) waitress 23. Wear a ………. and a helmet all time you’re in a boat. a) lifejacket b) repellent c) sunscreen 24. My elder sister is ………. . She never thinks about how other people may feel. a) honest b) selfish c) lazy 25. Too many people are having ………. surgery these days a) plastic b) social c) vocal
2. There are 8 columns in the periodic table. In each column, elements are arranged by the same properties, such as the same orbital arrangement of electrons.
3. Mendeleev predicted properties of yet undiscovered (missing) elements and left empty spaces for them in the table.
4. There are natural groupings between the elements that are closely related to each other.
5. In order to understand better these natural groupings, chemists have tried to fit the elements into a single plan.
6. John Ncwlands made one of the first attempts to fit the relationships among the elements by suggesting the Law of Octaves.