________ is not an easy thing for everyone to master a foreign language.
A. That B. This C. It
The problem must be __________ discovered next time.
A. farther B.far C.further
The doctor was busy _________ on the woman at that time.
A. operating B. operated C. to operate
Chinese _________ by Miss Wang three years ago.
A. taught B. was taught C. is taught
Where is my raincoat? I think _________ has taken it.
A. someone else
B. who else
C. anyone else
The ___________ prevented me from _________ part in the meeting.
A. sick; take
B. illness; taking
C. sickness; to take
