----My trousers ________green.----But this pair of trousers ________black.
—What does your sister usually do in the evening?—She usually______ TV, but now she _____ a book. .
—How does your father go to work?—He often goes to work __________.
After a long hiking, the boy was ________ tired to walk.
— There are still many old city walls in Xi’an, _______?—Yes, there are.
—Whose purple coat is this?—It ____ be Lily’s. Hers is red. It _____ be Lucy’s. She likes purple.