题目内容

I am __________ to my doctoral supervisor for his assistance.

A. grateful
B. compliant
C. reluctant
D. fearless

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Children who have free access to the internet are __________ to many potential dangers online.

A. treated
B. drawn
C. placed
D. exposed

I greatly ______ the assistance your company has offered.

Strict ______ measures are in force in the capital.

This system has ______ in most countries where it ruled.

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