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1. It’s recommended that we become more concerned ___________the environment around us.

A. of                            B. to                            C. about                      D. with

2. Air ____________ together with littering, is causing many problems in our cities today.

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

3. In the United States, there are 50____________ and six different time zones across the country.

A. states                      B. nations                    C. towns                                  D. countries

4. When a typhoon happened, many houses and roads ____________ destroyed or flooded.

A. is                            B. are                          C. were                                    D. was

5. ____________ is the most common natural disaster in your country?

A. What                      B. Which                     C. How                                    D. Who

6. ____________ you ever been to any EnglishSpeaking countries?

A. Do                          B. Are             C. Were                                   D. Have

7. If you ____________ yourself well, your parents will be happy.

A. behaves                  B. behaved                  C. behave                                D. behaving

8. He regretted not ____________ goodbye to his girlfriend at the airport.

A. to say                      B. say                          C. said                                     D. to saying

9. If I ____________ you, I would see the doctor immediately.

A. am                          B. were                        C. was                         D. will be

10. The teacher said ____________ a week off on the occasion of the International Labor Day.

A. we will have           B. we did have            C. we have                              D. we would have