John has never been on time, ( )?
A. as John
B. has not John
C. has he
D. has not he
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They had talked only for a few minutes ( ) they found they were of different Opinions.
A. unless
B. while
C. before
D. once
It is Important to provide an environment ( ) people are encouraged to make suggestions at all levels of the company.
A. from which
B. on which
C. in which
D. for which
Now I ( ) the life here.
A. used to
B. used
C. am used to
D. used to be
About seventy percent of the surface of our planet ( ) covered by water.
A. are
B. is
C. were
D. was