––Excuse me, could you tell me _______? ––Yes. It’s about twenty minutes’ walk.
—Could you tell me ___? —It’s twenty minutes by underground.
--- How many times you to the Great Wall? --- Once. I there three years ago.
—Would you like_________Shijing Hill with us next Sunday afternoon? —I will go with you unless my mother _________me.
—What happened to Billy? — He ___________ by the police because of his drunk-driving.
--What do you think of your math teacher? -- He is kind, he looks serious.