29.Hardly had I stepped into my office ________ the telephone rang.
A. as
B. when
C. while
D. since
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30.If you have any questions, please feel free to ___________ me at industele@aol.com
A. involve
B. relate
C. remember
D. contact
31.It was in New York __________ Johnson Smith published his book about the life of his father.
A. that
B. what
C. which
D. this
32.Have you ever wondered ___________ effect smartphones have on our way of learning?
A. how
B. where
C. what
D. when
33.When you're speaking English, don't be afraid of ____________ mistakes.
A. conducting
B. taking
C. creating
D. making