C.Use "still" or "yet":
1. They haven't returned from the trip ... .2. Isit ... raining? - Yes, it is. It hasn't stopped raining ... . 3. Has your brother graduated from the University... ? – No, he is ... a student. 4. No news has come from them as ... make sure it is true? 5. Do you ... want to - ww. ... 6. It was early ... , the sun hadn't ... risen. 7. We have ... a lot of things to finish. – It's all right. We ... have a lot of time. 8. It was late, ... we decided to stay. 9. She ... hopes to get a letter from him. 10. It was too early to speak about the resuits ... 11. I ... don't want to discuss this matter.

1)I have lost my wallet. I can't find it anywhere. 2)You're late. I am waiting for you half an hour. 3)Theyare staying with friends at the moment. 4)She never eats broccoli because she doesn't like it. 5)This shampoo  smells like roses. 6)Paul is going the bank. He hasn't come back yet. 7)How long did the Millers move to Edinburgh?(так не говорят, (ты сказала как длинно миллеры перезжали в эдинбург) просто замени на When)  8)My parents live in a big house (давай разнообразим- (near the seaside). 9)The plane already left by the time I reached the airport. 10)The train leave Manchester at nine o'clock. 11)Look out! You are going to fall down! 12)I promise I am going to be at home in dinner time. 13)By the end of the day, she will work ten hours 14)He saw a doctor this afternoon. 15)I want to see James tonight, I'll tell him good news. 16)The film will finish at 10 o'clock.(вроде бы всё, но много корявостей и хз могла что то пропустить).

Polluted their surroundings. But until now pollution was not such a serious problem. In past most people lived in uncrowded rural areas and didn’t have pollution-causing machines. But with the development of crowded industrial cities the problem of pollution has become more important. Using automobiles and other machines made pollution steadily worse. Since the 1950’s people have become alarmed with the danger of environmental pollution.Air, water, and soil are necessary for existence of all living things. But polluted air can cause illness, and even death. Polluted water kills fish and other marine life. On polluted soil, food products can’t be grown. In addition environmental pollution spoils the natural beauty of our planet.Pollution is a very complicated and a serious problem. Automobiles are polluting the air but they provide fast transportation for the people. Plants and factories pollute the air and the water but they provide jobs for people and produce necessary goods. Fertilizers and pesticides are important for growing crops but they pollute soil.Thus, people would have to stop using many useful things if they wanted to end pollution immediately. Most people don’t agree to do that. But pollution can be reduced gradually. Scientists and engineers can find the ways to reduce pollution from automobiles and factories. Government can pass the laws that would make enterprises take measures for reducing of pollution. Individuals and groups of people can work together to persuade enterprises to stop polluting environment.