---If each of us__________ the environment, the world will become more beautiful.---I agree with you.A. takes measure to protectB. make a contribution to protectingC. makes a contribution to protect
—Are the black shoes ____? —No. It’s ____.
—What do you want to buy? —____
—____ is your teacher? —It’s Miss Gao.
They are in ____ but in ____.
—Good morning. I want to buy two ____. —OK. Here you are.