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16. The flashing red light served as a of danger ahead.

A. predictor B. caution C. precaution D. prevention

17. According to the weather forecast, which is usually , it will snow this afternoon.

A. accurate B. dull C. awkward D. tedious

18. If his father could not keep up the payments on the mortgage, his uncle might it for him.

A. redeem B. amend C. resemble D. appeal

19. They made detailed investigations to themselves with the needs of the rural market.

A. adhere B. acknowledge C. acquaint D. activate

20. Radar is used to extend the of man’s senses for observing his environment, especially the sense of vision.

A. validity B. liability C. capacity D. intensity

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