根据句意或首字母填空，每空一词。

1.  He's on duty (值日) today.  He n_____  to clean the desk.

2.  He is always ill.  We call him a _____ boy.  Now he is ill in the h_____.

3.  The boy was w _____that he would fail the exam.

4.  —L_____! She is_____ her bike in the street.

   —Sorry, I can't s_____

5. —Thanks a lot.

   —_____ _____  = _____ _____ _____.