Вставить must или have to. 1. I mustn't tell about it. I __ tell it. I __ tell it. 2. Must he go to the library? Did he __ go to the library? __ go to the library? 3. A knight must be brave. A knight __ be brave. This knight __ be brave. 4. We must sign this agreement. We __ sign this agreement. 5. Jessica must take part in the dance competition. Jessica __ take part in the dance competition. Jessica __ take part in the dance comoetition.

I have to tell it. 2. have to, must

3.must, must

4.must

5. have to, have to

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.

1) The little boy said to his mother that he had not done that. 2) The teacher said that London was the capital of England. 3) Ella asked Bob whether he had ever seen the man. 4) Tom asked the stranger where was the police station. 5) The mother told Dan not to fight with his brother. 6) He said that Greece was hotter than England. 7) She told her son to eat his dinner. 8) Rob said to Mary that he would write her as soon as he arrived. 9) Hellen said he had gone for a walk the day before. 10) Ted suggested to play in the yard.