Find the correct answer A, B, C or D to complete the passage. People need to breathe. If they don’t breathe, they (17) ____________ die. But how clean is the air people breathe? If they breathe (18) ___________ air, they will have breathing problems. Plants and animals need (19) __________ air too. A lot of the things in our lives create harmful gases and (20) _________ the air dirty, like cars, motorbikes, and factories. Dirty air is called polluted air. Air pollution can also make our Earth warmer. 20. get make give made A. get B. make C. give D. made 21 Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions. In the future, people will build houses on the moon. The best place for houses in a moon town will be underground. Underground houses will be safe, and the temperatures will not be very high during daytime and not very low at night. Moon homes may be balloons with oxygen, and people will wear oxygen masks when they are away from home because the moon has no air around it. The house might have beds, tables, and chairs, so people will sleep, eat, and work in their home. Moon-house building will be easy. Question: 21. In a moon town, what is the best place for house? A. a balloon B. in the air C. underground D. on the ground 22 Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions. In the future, people will build houses on the moon. The best place for houses in a moon town will be underground. Underground houses will be safe, and the temperatures will not be very high during daytime and not very low at night. Moon homes may be balloons with oxygen, and people will wear oxygen masks when they are away from home because the moon has no air around it. The house might have beds, tables, and chairs, so people will sleep, eat, and work in their home. Moon-house building will be easy. Question: 22. Which of the following is true? A. The moon homes are very hot during daytime. B. The people on the moon will not leave their homes. C. The temperatures will be very high during daytime and very low at night. D. The people on the moon will wear oxygen masks when they leave their homes. 23 Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions. In the future, people will build houses on the moon. The best place for houses in a moon town will be underground. Underground houses will be safe, and the temperatures will not be very high during daytime and not very low at night. Moon homes may be balloons with oxygen, and people will wear oxygen masks when they are away from home because the moon has no air around it. The house might have beds, tables, and chairs, so people will sleep, eat, and work in their home. Moon-house building will be easy. Question: 23. Why do people need oxygen when they stay on the moon? A. Because the moon has no air. B. Because the moon is too large. C. Because people sleep, eat, and work outside their houses. D. Because the moon houses are full of air. 24 Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions. In the future, people will build houses on the moon. The best place for houses in a moon town will be underground. Underground houses will be safe, and the temperatures will not be very high during daytime and not very low at night. Moon homes may be balloons with oxygen, and people will wear oxygen masks when they are away from home because the moon has no air around it. The house might have beds, tables, and chairs, so people will sleep, eat, and work in their home. Moon-house building will be easy. Question: 24. How comfortable are the houses on the moon? A. They have furniture for people to sleep, eat, or work. B. They have many balloons. C. They don't have any furniture. D. They have all kinds of furniture. 25 Mark the letter A, B, c, or D to indicate the sentence that is rearranged from the given words. on / My / will / the / future / ocean / house / be /. A. The future house will be on my ocean. B. My ocean house will be on the future. C. My house will be on the future ocean. D. My future house will be on the ocean.