Having checked the doors were closed, and _____ all the lights were off, the boy opened the door to his bedroom.
A. why
B. that
C. when
D. where
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The last time we had great fun was _____ we were visiting the Water Park.
A. when
B. Where
C. how
D. why
Could I speak to _____ is in charge of International Sales please?
A. who
B. whomever
C. whatever
D. whoever
As a new diplomat, he often thinks of _____ he can react appropriately on such occasions.
A. what
B. which
C. that
D. how
People often have this belief ________ development is bad for the environment. But this does not have to be true.
A. that
B. which
C. where
D. how