1.Only after food has been dried or canned ______.
A. that it should be stored for later consumption
B. should be stored for later consumption
C. should it be stored for later consumption
D. it should be stored for later consumption
2.______ in the United States was set up to train men in music at that time.
A. Many schools
B. Many a school
C. A many school
D. A great many schools
3.No matter how frequently ______, the works of Beethoven always attract large audiences.
C. to be performed
D. being performed
4.The pressure ______ causes Americans to be energetic, but it also puts them under a constant emotional strain.
A. to compete
C. to be competed
D. having competed
5.It seems oil ______ from this pipe for some time. We'll have to take the machine apart to put it right.
A. had leaked
B. is leaking
D. has been leaking