I found _________difficult to work out the problem.A it’s B this C that D it
—Wish you good luck in this English exam!—________
—What is Jim doing over there?—He is ________ his friends.
—Is Mary in the library,Tom?—No.She ________ with her friends.
—Are you doing your homework?—________.
Zack is ________ newspapers,his mother is ________ TV and his brother is ________ a film.