The factory produces two million pairs of shoes every year, half _______ are sold abroad.
#77856
A
of which
B
which of
C
of them
D
of that
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  The hottest continent, Africa has a lot of resources, ______ are still undeveloped.
#75744
A
many of them
B
many of whom
C
many of it
D
many of which
I shall never forget those days ________ I stayed on the island ________ you visited last week.
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A
when, where
B
which, which
C
when , which
D
which , where
We should get prepared for dealing with ________problems_________.
#77649
A
any,arise
B
which,are arisen
C
whatever,arise
D
what,are arisen