11._______ for your laziness，you could have finished the assignment by now.
A. Had it not been
B. It were not
C. Weren‘t it
D. Had not it been
12.The new discovery _______ be of great service to mankind.
A. is bound to
B. is bound for
C. be bound to
D. be bound for
13.Sickness often _______ eating too much.
A. as a result of
B. result of
C. result in
D. result from
14.It took me a month to get rid _______ the cough.
A. for
B. as
C. of
D. over
15.They are eager _______ abroad.
A. travel
B. travelled
C. to travel
D. travelling
