V. Find the mistake in the four underlined parts A, B, C or D of each sentence.

1.  If someone came into the store, smile and say, “May I help you?”

     A                  B                            C                     D

2.  If you try these cosmetics, you look five years younger.

     A       B                                     C                        D

3.  If you do not understand what were written in the book, you could ask Mr. Pike.

     A                B                                C                                         D

4.  I will come to meet Mr. Pike and tell him about your problems if you didn’t solve them    A             B                                                     C                         D

     yourself.

5.  Sam will not graduate unless he doesn’t pass all the tests.

                A                        B                 C                D

6.  If there isn’t enough food, we couldn’t continue our journey.

     A             B           C                             D

7.  Unless you pour oil on water, it will float.

        A               B        C                    D

8.  You have to take a taxi home if you want to leave now.

                A        B                      C               D

9.  If anyone will phone, tell them I’ll be back at 11:00.

     A                  B             C             D

10. We can hire a mini bus if there will be enough people.

              A               B           C          D

11. If we keep on using more and more cars, we are running out of oil.

A                          B                             C                    D

12. We should reuse and recycling bottles and cans to reduce garbage.

                           A               B                    C                   D

13. People collect the broken glass and sending it to the factories.

A                B                       C                         D

14. If there will be too much exhaust fume in the air, our breathing will be badly affected.         A                               B                                      C                     D

15. Reusable bags are good because they make of natural materials.

A                B               C           D

16. Remember to turning off the light when you go out.            

                                  A       B                    C               D

17. If she throws the rubbish onto the river, all fish will die.               

                    A                 B        C                                  D

18. We will save our world if we protected our environment.             

                      A             B                     C          D

19. We can save money if we reduce gas, electricity but water.           

       A           B                             C                               D                       

20. If she be late for her English class, the teacher will be angry.

                A          B                  C                                     D