—When did your cousin begin to show his interest in medicine?—It was a Saturday ___ she noticed her uncle experimenting on a frog in his lab. 
#34174
A
that
B
what
C
when
D
which
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______ comes will be welcomed to the open-air concert.
#33441
A
Whatever
B
Whoever
C
No matter what
D
No matter who
___he hasn’t come is_______ he is busy writing his novel.
#34516
A
Why, because;
B
Why, for;
C
That, because;
D
What, for
Could it be in the room _____ we had a talk last night _____ you left your keys?
#33330
A
that; that
B
where; that
C
where; where
D
that; where