______ the secret of how to make silk remained inside ...

[ Conjunctions ]

______ the secret of how to make silk remained inside Asia, Europeans were forced to pay incredibly high sum of money for this mysterious material to be bought overland to Europe.

A. Although

B. Only if

C. Due to

D. As long as

Select your answer:

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He didn’t _______________ the question.

A. understand

B. understood

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Choose the best option to fill in the gap: The question of late payment of the bills was ____________ again at the meeting.

A. taken

B. risen

C. raised

D. brought