Exercise 3: Choose the best answer.
6. I think technology __________ make the world a better place. 

A. will                                     B. won’t                    C. have to                    D. is going to

7. You usually need a _____ to go from one country to another.

A. postcard                             B. passport                  C. permission              D. allow

8. Are you interested _____ Taekwondo?

A. in                                        B. about                      C. at                            D. of

9. I _____ aerobics three times a week at my local gym.

A. play                                    B. go                           C. do                           D. take

10. Air ______ is a serious problem that our city is facing due to our own activities.

A. pollute                                B. polluted                  C. pollution                 D. pollutant