He was sitting in an armchair, ___ a novel 
#97789
A
reading
B
read
C
was reading
D
to be reading
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 -Would you like to sing a song for us?-_____.
#98322
A
I prefer not
B
I prefer not to
C
I prefer to not
D
I wouldn't prefer
 He made up his mind to devote his life ______ the river ______ polluted.
#88705
A
to prevent; to be
B
to prevent; from being
C
to preventing; to be
D
to preventing; from being
In order not to be disturbed, I spent three hours _______ in my study. 
#90643
A
locking
B
locked
C
to lock
D
to be locked