The chairman thought________necessary to invite Professor Smith to speak at the meeting .
Long term of hard work and lack of sleep finally ______ her health.
—Would you mind giving your advice on how to improve our efficiency? —If you make _____ most of forty-five minutes classes day after day, there will be _____ switch in grades.
China is known __ ____ greatly in terms of its cultural values over the past few years.
—I did very well in the English exam last week. —I did ______. I got a full mark.
I need to call my friend David ______ coat I walked off by mistake yesterday.