29. —I find difficult to learn English grammar.
—You can do more English exercises.
A. that B. this C. those D. it
30. The story is _________ and all of us are _______ in it.
A. interest; interesting B. interesting; interest
C. interested; interesting D. interesting; interested
31. —Do you believe that American flags are made China?
—Yes, I do. And you can see they are made silk.
A. in; from B. from; in C. of; in D. in; of
