We are worried about our son because no one is aware ______ he has gone.
A. the place
B. of where
C. about the place
D. where
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When he just got off the plane, he gave us a good description of ______ in Spain.
A. what he had seen
B. that he had seen
C. which he had seen
D. he had seen what
It is fitted with a small transformer, by means of ______ the voltage of the currency can be adjusted.
A. whom
B. which
C. what
D. that
I don’t know why she’s looking at me ______ she knew me. I’ve never seen her before in my life.
A. as
B. although
C. even if
D. as if
It is hard to avoid mistakes. ______ you correct them conscientiously, it will be all right.
A. In the case
B. As long as
C. Although
Despite