Stage fright is a common example of___educators call  a“lack of confidence”among students.

. It’s a secret. Why don’t we go and talk about this somewhere quieter? _______, you know.

Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.

Tom told us all that          he said at the meeting was really true．

I thought things would get better, but         it is they are getting worse.