III. Choose the correct answer A, B, C, or D.

1.      In the future, many cars will run ________ electricity, which doesn’t cause air pollution.

            A. in                             B. on                                        C. by                                        D. with

2.      You should turn the tap ________ when you brush your teeth to save water.

            A. up                            B. down                                   C. on                                        D. off

3.      You should donate your old clothes, toys and furniture to people in ________.

            A. order                       B. fact                                      C. need                                    D. case

4.      ________ robots can help to teach children in the classroom, they will never replace teachers.

            A. When                      B. Although                              C. Because                               D. If

5.      There are lots of ________ problems nowadays, mainly because of pollution.

            A. natural                    B. social                                   C. practical                              D. environmental

6.      To ________ waste we should avoid buying products with a lot of packaging.

            A. recycle                    B. reuse                                   C. reduce                                 D. remake

7.      ‘Will robots be more and more expensive?’ ‘_______ Prices will become cheaper over time.’

            A. Not at all.                B. Sure.                                    C. Sounds great!                     D. I think so.

8.      The Amazon River is ________ river in the world.

            A. the wider                B. wider than                           C. the widest                           D. widest

D

X. Find a mistake in the four underlined parts of the sentence.

1.      In the centre is the bigest island in the bay.                           à __________________

                                   A   B     C                        D

2.      Big cities are much more better than the countryside.          à __________________

                                    A          B                C    D        

3.      Fansipan is Vietnam’s the highest mountain.                         à __________________

                           A       B          C          D

4.      That is the worse Joke I’ve ever heard in all my life.             à __________________

                        A          B          C                      D

5.      This is the most quickest way to the hotel.                            à __________________

                    A  B           C                      D