______United Nations was founded in 1945. ()
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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
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
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