People should _________ down trees in order to protect the environment.
Are those your parents? ______A. Yes, he is.B. No, they are.C. Yes, they are.
This is my good friend. _______ first name is Mary.A. She B. He C. Her
I like oranges, but my mother _______like oranges.A. don’tB. doesn’tC. isn’t
--- Does he often(经常) watch NBA _______ TV?- No, he ________.A. in, do.B. on, doesC. on, doesn’t
I don’t have a watch, but my brother _______.A. does B. do C. have