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C. one D. it 6. How long are you staying? I don’t know. . A. That’s OK B. Never mind C. It depends D. It doesn’t matter 7. It was raining heavily. Little Mary felt cold, so she stood to her mother. A. close B. closely C. closed D. closing 8. Will you be home to see the children before they go to bed? A. on time B. in time C. at a time D. at one time 9. The festival has been a great success, last year when it rained nonstop. A. like B. alike C. unlike D. dislike 10. Measures have been taken to prevent the river from . A. having polluted B. being polluting C. being polluted D. to polluted 11. What are the differences between the American and Britain of government. A. systems B. religions C. barbers D. theories 12. It is generally accepted that smoking is to our health. A. harmless B. harmful C. harm D. harmfully 13. Try and a bit。 Unit4 一、 根據(jù)句意填入單