—David has made great progress recently. —______, and______.
A. So he has; so you have
B. So he has; so have you
C. So has he; so have you
D. So has he; so you have
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Much has been written on the virtues of natural childbirth, but little research has been done to______these virtues.
A. confirm
B. consult
C. confess
D. convey
I'd like to rent a house, modern, comfortable and ______ in a quiet and safe neighborhood.
A. all in all
B. above all
C. after all
D. over all
______from heart trouble for years, Professor White has to take some medicine with him wherever he goes.
A. Suffered
B. Suffering
C. Having suffered
D. Being suffered
The concert will be broadcast live to a worldwide television audience______at one thousand
A. estimating
B. estimated
C. estimates
D. having estimated