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11. I was in my reading, and didn’t at first hear the doorbell ring.
A. immured B. immersed C. busy D. infatuated
15. When he lived in that remote place, radio was the only means he had to keep current events in the country.
A. account B. trace C. record D. track
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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