Exercise 1: Choose the correct word marked A, B, or C to fill each blank in the following passage. 

AIR QUALITY

People need to breathe. If they don't breathe, they (1) ____ die. But how clean is the air people breathe? If they breathe (2) ____ air they will have breathing problems and become (3) ____ Plants and animals need (4)____ air too. A lot of the things (5) ____ our lives create harmful gases and (6) ____ the air dirty, like cars, motorbikes and factories. Dirty air is called (7) ____ air'.Air pollution can also make our Earth warmer. The problem of air pollution started with the burning (8) ____coal in homes and factories. 

1. A. will                                  B. are                            C. must

2. A. clean                              B. fresh                         C. dirty 

3. A. well                                 B. better                       C. ill 

4. A. clean                              B. safe                          C. dirty

5. A. at                                    B. in                             C. on

6. A. make                               B. get                          C. give 

7. A. pollute                             B. polluted                   C. poluting 

8. A. in                                     B. for                           C. of

Answer:

Exercise 2: Read the passage and do the exercises.

1. Recycling means using rubbish to remake new goods that can be sold again. For example, when you put bottles and cans in the recycling bin, people take them to a factory. In this factory people reprocess these bottles and cans into many new things.

2. The most well-known recycled materials are glass, paper, plastic, and aluminum. Other recyclable materials include batteries. kitchen waste, steel, iron, cotton and timber.

3. Recycling starts when you or your parents drop recyclable materials. such as bottles and cans in the recycling bin. Next, collectors come to pick up the materials and take them to a processing factory where they are sorted and processed into raw materials. After that factories sell these materials to manufacturers who make the things you buy. These manufacturers make new items from them. Finally, you or your parents buy items made from recycled materials. 

a, Match the words in A with their meanings in B. 

b, The passage has three paragraphs 1- 3. Match them with the headings a - e.

a. The process of recycling

b. The definition of recycling

c. Things to be recycled 

c, Reorder the following pictures to make a recycling process. 

Answer:

a,

b, 1. b                     2. c                 3. a

c, b - d - e - c - a