1. Solve the following crossword puzzle

Across

1. Dirty _____ causes breathing problems.

4. Things you throw away because you don't need them are called _____

7. You can take these bottles to _____ the factory to them. 

8. Please _____ your envelopes.

Down

2. If you ____ the time for your shower, you will save a lot of water.

3. Loud _____ can annoy people.

5. You can make flower vases from old _____

6. Fish die when _____ in lakes, rivers and oceans is dirty. 

=> Answer:

1. air                        2. reduce                         3. noisy                         4. rubbish

5. bottles                 6. water                            7. recycle                      8. reuse

2. Read each tip for preventing pollution and match it with a suitable picture. 

=> Answer:

1. f                2. h                3. c                4. g                5. e                6. a                7. d                8. b

3. Write a/an or the.

1. We have ____ cat, ____ dog, and ____ goldfish as pets.

2. ____ Earth is the third planet from ____ Sun.

3. My grandfather is ____ astronaut and my father is ____ pilot

4. Do you live in ____ house or ____ flat?

5. Do you have ____ umbrella in your car? 

=> Answer: 

1. a/ a/ a                2. The/ the                    3. an/ a                 4. a/ a                   5/ an

4. Complete the following conversation by putting in the correct positive or negative forms of the verbs in brackets.

Vy: What are you doing. Mi?

Mi: I'm writing a paragraph about the ways to save our environment 

Vy: Let me see. (Vy reads Mi's writing.) If you (1. take) a shower instead of a bath, you (2. save) water.

Mi: Can you give me some more ideas?

Vy: Sure. If you (3. cycle) more, there (4. be) less air pollution.

Mi: Why? Vy: Its simple. If you (5. cycle) you (6. produce) fumes. If there (7. be) fumes. the air (8. be) cleaner.

Mi: I see. I have another idea. If people (9. plant) more trees, there (10. be) floods.

Vy: That's right. (Vy looks at her watch.) Oh. it's five already. If I (11. not hurry)  I (12 be) late for my English class. Bye, Mi.

Mi: Bye, Vy.

=> Answer:

1. take                 2. will save                  3. cycle                  4. will be

5. cycle                6. will produce            7. is                        8. will be

9. plant                10. will be                  11. don't hurry          12. will be

5. Use the words given to make a first conditional sentence. Make necessary changes and add some words.

1. If / burn rubbish. / produce harmful smoke. 

2. If / reuse bottles, / save a lot of money. 

3. If / use recycled paper. / save / trees. 

4. If / plant trees in the schoolyard, / school/greener place. 

5. If / rubbish bin in every class, / classroom / cleaner. 

=> Answer:

1. If you burn rubbish, you will produce harmful smoke.

2. If we use reusable bottle, we will save a lot of money.

3. If we use recycled paper, we will save trees.

4. If they plant trees in the schoolyard, their school will be a greener place.

5. If there is rubbish bin in every classroom, the classroom will be cleaner.