Some pictures of the river brought the days back to the day______ they swam in it.
#73249
A
when
B
that
C
who
D
where
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I have two grammars, ______are of great use. 
#73806
A
all of which
B
either of which
C
both of that
D
both of which
Many experts agree that there is a possibility___ in this area in the following days.
#69074
A
when some more earthquakes may happen
B
that some more earthquakes may happen
C
where may some more earthquakes happen
D
what may some more earthquakes happen
This is the only one of the books on space ___.
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A
that has been written
B
that have been written
C
which have been written
D
which has been written