Besides damaging people’s ability to do their best in sports, lack of sleep has also been linked to _______ troubles, such as feelings of sadness.
A. physical
B. emotional
C. clinical
D. intellectual
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Setting up separate bicycle tracks is an effective way to _______ bicycle accidents and improve the safety for riders who share the road with motor vehicles.
A. curb
B. clip
C. surge
D. solve
In the last two decades world production of electricity has roughly doubled, with the developing nations _______ the developed.
A. surging
B. overtaking
C. hauling
D. reversing
Language and culture are closely related with each other, and the understanding of one requires the understanding of _______.
A. other
B. another
C. the other
D. some other
The boss was in a temper. Do you know _______ made him so angry?
A. what was it
B. what it was that
C. what it was
D. what was it that