I felt so embarrassed that I could not do anything but ( ) there when I first met my present boss.
A. to sit
B. sitting
C. sat
D. sit
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I could have called you yesterday, but ( ) I your telephone number.
A. did not have
B. will not have
C. had not had
D. would not have
John has never been on time, ( )?
A. as John
B. has not John
C. has he
D. has not he
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