We must protect the natural ____ . One of the ____ that people have today is the side effects of covid-19. Rare ____, national parks and villages are under threat. There are different ____ problems. Alex is not very ____ about his marks at school. There is a serious ____ of food in some areas. The house ____ two bedrooms, a kitchen, and a living room. People mustn't use weapons of mass ____. Water is our country's most important ____. The ____ was so bad that most of the fish died. The lizards are said to be an ____ species. I didn’t see a single piece of ____. The accident ____ about 11: 40 p. m. Friday. I ____ to your letter of 22 March.

Environment

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