During____century,theworldpopulationhasalreadyreached6billion.
A. twenty
B. thetwentieth
C. twentieth/
D. thetwenty
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Shewas___herearlytwentieswhenshewentabroad.
A. at
B. on
C. of
D. in
TheymovedtoBeijing___.
A. in1980s
B. inthe1980
C. inthe1980s
D. onthe1980\'s
Hebegantoworkthere____.
A. onhisfifty
B. ageoffifty
C. whenhefifty
D. inhisfifties
Hewasdoingsomewashing____.
A. ateightyesterdaymorning
B. yesterdaymorningeight
C. yesterdaymorningateight
D. byeightyesterdaymorning
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