單項選擇題

Construction of the railways helped to develop the national （） of Tanzania and Zambia.

A.economic
B.economies
C.economics
D.economical

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單項選擇題

Take it（）It is nothing but a joke.

A.easy
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C.serious
D.seriously

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I'm（）to graduate in the next half of the year.

A.owing
B.thanks
C.due
D.because