_______nobody at home, the visitor decided to leave a note by the door.
A. When
B. Seeing
C. See
D. To see
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Last year Sam earned _______his brother.
A. twice as more
B. twice as many as
C. more twice than
D. twice as much as
I have no doubt ________he will overcome all his difficulties.
A. if
B. that
C. as to
D. whether
I heard Tom _______ (sing) in his room.
The machine _________ (export) to Italy needs repairing.