单项选择题

In ancient time’s people used to build their houses with materials()

A. convenient 
B. important 
C. available     
D. natural

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When I leave the research institute next week, I()there for 18 years.

A. shall be working  
B. will work
C. shall have worked 
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()of danger, he jumped into the river all at once.

A. Because   
B. In terms     
C. Instead  
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