---Could you please come to the museum with me this afternoon?---Sorry, I ______ . I have to take a piano lesson at 2 pm.
Learning about culture is ________ as learning grammar and words.
The teacher speaks very loudly ________ all the students can hear her.
—Have you ever been to Shanghai? —Yes. I _________ there with my father last year.
—Do you like talking with your friends on the telephone or mobile phone? —________. I enjoy chatting online.
—Were you at home at 8:00 last night? I called you but nobody answered. —Sorry, I ________ a nap at that time.