The doctor _______ on the man and _______ saved his life.
A. did a operation; / B. did an operation; was
C. operated; / D. operated; was
Students can’t be made ____________ all day.
A. study B. to study
C. studying D. of study
You know great changes _____________ in our school in the past ten years.
A. have been taken place B. took place
C. have taken place D.were taken place
Paul doesn’t know _________ about his problems.
A. how to talk to B. who to talk
C. where to talk to D. who to talk to
--Who _______ the Harry Potter series________ ? -- J.K.Rowling.
A. did, be written B.was, written
C. was, written by D. did, be written by
We know that about seventy percent _____ the earth _____ covered by water.
A. /; is B. of; are
C. of; is D. about; are
