I feel I am entitled to a full refund in addition to an apology for the inconvenience _________.
A. to cause
B. causing
C. cause
D. caused
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Only by adopting the highest standards of integrity ______ the trust of our clients and the companieswe work with.
A. we earn
B. can we earn
C. we can earn
D. we will earn
If I ______ the challenges at that time, I might not have started my own business.
A. would know
B. have known
C. had known
D. will know
It was not until last July _______ we started to distribute e-readers and launched an e-book store.
A. that
B. who
C. which
D. whom
_________ the library for hours without finding anything useful, I turned to my professor for help.
A. To search
B. Having searched
C. Have searched
D. Searching