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A.however othersB.while the othersC.while othersD.however the others

A. however others
B. while the others
C. while others
D. however the others

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Geologists (at) the Hawaiian Volcano Observatory (rely on) (a number of) instruments to (studying) the volcanoes in Hawaii.

A. at
B. rely on
C. a number of
D. studying

【31】, optical illusion can cut highway crashes. Japan is a case【32】. It has reduced automobile crashes on some roads【33】 nearly 75 percent using a simple optical illusion. Bent stripes, called chevrons【34】 the roads make drivers think that they are driving faster than they really are, and thus drivers slow down. Now the American Association Foundation for Traffic Safety in Washington D. C. is planning to【35】 Japan's success. Starting next year, the foundation will paint chevrons and other patterns of stripes on selected roads mound the country to test how well the patterns reduce highway crashes. Excessive speed plays a major role【36】 one fifth of all fatal traffic accidents, according to the foundation.【37】 those accidents, the foundation will conduct its tests in areas where speed-related hazards are【38】-- curves, exit slopes, traffic circles, and bridges. Some studies suggest that straight, horizontal bars painted across roads can initially【39】 the average speed of drivers in half【40】 , traffic often returns to full speed within, months as drivers become used to seeing the painted bar.
(31)

A. Believing it or not to
Believe it or not to
C. Believing it or not
D. Believe it or not

School counselors (are convinced) that it will be obligatory that everyone (must have) (some computer training) in order to (enter) the job market.

A. are convinced
B. must have
C. some computer training
D. enter

(After having studied) (so hard) for more than two months, he (felt confidently) of (success).

After having studied
B. so hard
C. felt confidently
D. success

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