He isn’t a diligent boy, for it is the second time he has been late,      ?

— _______   _______do you go to the library?—Twice a week. 

 ______your parents ________ Beijing?

--__________ you see the traffic accident near the park yesterday? -- No, I didn’t.

 —I couldn’t get through to you at home last night. You must have gone out then, ________?  — Yes, I went to the cinema.