1. No one knows (確切) how old the man is.
1. for certain
題目來源：仁愛英語同步練習簿九年級上下冊 > Topic 3 China is the third nation that sent a person into space.
口算小狀元口算速算天天練系列答案科目：初中英語 來源： 題型：
( ) 3. Scientists are doing experiments in order more of Mars.
A. exploring B. to explore
C. explore D. to exploring
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1. Jeans designed for workers in the 1850 s are now popular with all people.(改為同義句）
Jeans for workers in the 1850s are now popular with all people.
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( ) 1. China is country to send a manned spaceship into space.
A. the first B. the second
C. the third D. the fourth
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( ) 3. The earth is a planet which goes around the sun.
A. walks B. plays
C. travels D. change
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