Interest is as ________ to learning as the ability to understand, even more so.

The music was so _______ that everyone present felt ________ at it.

—Do you have any idea why Mark is leaving?—No. In fact，everyone is _________about it. 

Tibet is facing a(n)____task to maintain  stability and all government workers must be on their highest guard.

Our research has focused on a drug which is so _____ as to be able to change brain chemistry.