A research suggests that a( )jogging every day is enough to keep people away from becoming obese.
A. 30–minute
B. 30 minute
C. 30 minute’s
D. 30–minutes
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Would you please pass me( )book on the right?
A. the fourth
B. the four
C. four
D. fourth
About ____ of the students in the school were born in the____.()
A. two-thirds; 1990
B. two-thirds; 1990s
C. two-third; 1990
D. two-third; 1990s
We all think that the ( ) century will encounter many challenges.
A. twenty-first
B. twentieth-first
C. twenty-one
D. twentieth-one
( )trees have been planted along the river, so the river never overflows.
A. Two hundreds
B. Hundred of
C. Hundreds of
D. Hundreds
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