A．workB．regardC．serveD．signify
A. work
B. regard
C. serve
D. signify
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A．yetB．butC．andD．so
A. yet
B. but
C. and
D. so
A．chanceB．purposeC．opportunityD．basis
A. chance
B. purpose
C. opportunity
D. basis
Researchers think that it is______.
A. safe to eat fresh fish
B. dangerous to get close to the algae
C. safe to be near the algae
D. dangerous to expose the algae
When did pensions reach the height of their popularity？
A. In the late 1970s.
B. In the early 1970s.
C. During World War Ⅱ.
D. In the late 1960s.
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