—Are you helpful at home? — .A. Yes, I am. B. Yes, I can. C. Yes, I do.
The Whites _____ many places of interest since they came to China.
- What did you do last night? -- I did my homework and _____ TV.
The doctor often tells him ____ more exercise.
- Can you sing the song in English? -- No, I ____.
Bruce, look at your dirty shoes. You'd better _____ them right now.