IV. Write sentences

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

2.  If /you/ reuse/ these bottles, you /save /lot / money.

3.  If /students/ use/ recycled paper, they /save / lot / trees.

4.  If /students /plant trees / schoolyard, their school /be / greener place.

5.  If there / a rubbish bin /every class, the classroom /be /cleaner.

III.Use the correct forms of the verbs in brackets.

1.If you (1. take) ______ a shower instead of a bath, you (2. save)_____ water.

2. If you (3. cycle)_____ more, there (4. be)______ less air pollution.

3. If you (5. cycle)_______ , you (6. produce)_____ fumes.

4. If people (9. plant)____ more trees, there (10. be)____ floods.

5. If I (not hurry)……………………, I (be)…………….. late for my English class.

III.Use the correct forms of the verbs in brackets.

1.If you (1. take) ______ a shower instead of a bath, you (2. save)_____ water.

2. If you (3. cycle)_____ more, there (4. be)______ less air pollution.

3. If you (5. cycle)_______ , you (6. produce)_____ fumes.

4. If people (9. plant)____ more trees, there (10. be)____ floods.

5. If I (not hurry)……………………, I (be)…………….. late for my English class.

Tính hợp lí:
\(\dfrac{-4}{1.2}+\dfrac{-4}{2.3}+\dfrac{-4}{3.4}+...+\dfrac{-4}{97.98}+\dfrac{-4}{98.99}\)

31. With a smart watch, you will………….          your friends in other countries.

      A. speak                      B. talk                          C. say                          D. contact

32. Robots will help us do the housework such as____ the floors, ………    meals and so on.

      A. clean - cook            B. to clean - to cook    C. cleaning – cooking D. cleaning - to cook

33. He hopes he will reduce the monthly cost of gas when he uses_____ energy for cooking foods or heating water.

      A. warm                   B.        solar              C. sunlight                  D.        hot

34. He believes that he saw a__ _____ flying in the sky last night. He was scared that the aliens would appear and take him out of the earth.

      A. ship                         B. motorhome             C lantern               D. UFO

35. He's living in a_____ on a large river. It's very convenient for him to catch fish every day.

      A. palace                     B. airplane                    C. houseboat                    D. flat

36. There are a lot of__ _____in her big city. I can't count how many floors there are.

      A. skyscrapers             B. spaces                       C.  programmes   D. tractors

37. She can keep vegetables and fruits fresh in her______ during a long time.

      A. helicopter                B. modern fridge           C. electric cooker            D. spaceship

21. A hi-tech robot will help us                             children while we are away.

      A. look out                  B. look at                     C. look after                D. look in

22. We might have robots_____ our meals.

      A. cook                       B. to cook                    C. cooking                   D. to cooking

23. I might have a smart phone ………………..  the Internet.

      A. surf                         B. to surf                     C. surfing                    D. to surfing

24. We also watch films ______smart phones.

      A. in                            B. at                             C. on                           D. to

25. "Do you think we will________ holiday to the Moon?"

      A. go                           B. go on                      C. go on the                 D. go for

26. "Do you think that our houses will be___ space?"

      A. in                            B. on                          C. at                             D. to

27. Our future houses will use______ energy, and they are very friendly to the environment.

      A. sun                          B. sunny                      C. solar                        D. lunar

28. We will have more robots_____ they can help us do housework and protect our houses.

      A. so                            B. because                   C. so that                     D. although

29. A super smart TV will help us…………        goods from the supermarket.

      A. take                         B. buy                         C. carry                       D. order

30. We will have a robot in the garden____ the flowers and ____the dogs and cats.

      A. cut-take                   B. water - feed             C. feed - take               D. water - to wash