He has done _________ to improve his English.
— is your pen ?—It's black .A. What's color B. What C. What color
—I __________ for Hongkong to visit Disneyland tomorrow.—Have a good trip.
Teachers should _____ their students to practice _____ English as much as possible.
I’ve faced some difficulties, but they were nothing compared _____yours.
________ language you speak, you need to know Chinese if you work in China.