Здравствуйте Задание 8.3. Вставьте подходящие по смыслу союзы и предлоги.
Of, by, in, about, as well as, and, on
1. Scheele ... Priestley obtained ... oxygen ... heating various compounds ... the element. 2. Priestley recognized that the gas obtained ... him plays an important role ... combustion. 3. Priestley ... Scheele remained adherent... the phlogiston theory... combustion. 4. The combustion... a substance consists ... its combination with oxygen. 5. Oxygen occurs ... the free state ... the atmosphere.

1are the cooks in the kitchen? yes, they are. no , they are not. 2 are the waiters in the dining hall? yes, they are. no ,they are not. 3 are the tables set for dinner? yes, they are. no ,they are not. 4 is the watermelon juicy? yes, it is. no it is not 5 is the menu card on the table? yes , it is. no it is not. 6 is he a good waiter? yes, he is. no he is not. 7 are cigarettes on sale? yes, they are. no they are not. 8 are there any flowers on the table? yes, there are. no there aren't. b) 1 is the dining hall small? no, it is not. 2 are the waiters in the dining hall now? no , they are not. 3 are the tablecloths on the tables now? no , they are not. 4 are menu cards on the table now? no , they are not. 5 is steak on the menu today? no , it is not. 6 is mary a headwater ? no, she is not. 7 are cigarettes on sale? no , they are not. 8 are there any flowers on the table? no , there are not.