The teacher has a(an) ___________ to get off topic; sometimes it is difficult for students to make out what he is saying.  

Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first ______.

—How did you do in the driving test yesterday? —I had a narrow ______. My month-long practice gave me some comfort.

The government will begin a series of_____ to help the public fully understand the new educational system．

Fever is a ________of many illnesses. So I suggest you take it seriously and see a doctor as soon as possible.