Li Xing’s illness(病) is very_____. You must take his illness ______. 

．—How is your English going? —      .

--Have you returned the book to the library _______? --Yes, I have ____ returned it.

---  _______ does your sister go to school?---  At 7 o’clock.

 — I have great ________ in finishing the work by myself. Could you help me?— No problem.