нужно вставить “which,that,who,whom,whose”
1 Global warming is a general increase in the temperature ...is affecting many countries. 2 Michael is the man ... daughter is a well-known scientist. 3 A tropical forest is an area .. tall trees grow very close together. 4 This is the lady ... can show you the way to national parks without a car. 5 Deforestation is really bad in the mountains... many trees are cut down every year. 6 We live in a time ... some animals may stop existing because of hunting and pollution.

Most importantly, our task is not to harm nature, not to pollute the water, air, forest. Very often people relaxing in the forest throw concern jars, plastic or glass bottles, plastic bags. For a moment they wondered how is the forest that gave them shelter and rest. And if realized that the forest is alive, that he's hurt the same as us when the eye gets the insect. Only we can get rid of the foreign object, and the forest can not, he needs our help. There are "tourists" that even the fire is not quenched, when you go to the house. That's a crime. The wind blows, and can ignite a wildfire, and with it students already can not cope. Will have to call the fire Department, and the offenders have to answer for his act before the law.

Postcards always spoil my holidays. Las summer I (went) to Italy. I ( visited) museums and ( sat) in pubic gardens. A friendly waiter (taught) me a few words of Italian. Then he ( lent) me a book. I (read) a few lines, but (did not understand) a word. Every day I ( thought) about postcards. My holidays ( passed) quickly, but I (did not  send) any cards to my friends. On the last day I ( made) a big decision. I ( got up) early and ( bought) thirty-seven cards. I (spent) the whole day in my room, but I (did not write) a single card!