Don’t worry, Sir. I’m sure I can run _________ to catch up with them.

---Don’t step on the grass next time, Mike. 

  --- ___________

  A. Is that so?        B.   Don’t worry.     C. I don’t know. D. Sorry, I won’t.

— The radio says the heavy rain will stop later this afternoon.

—__________________.

A. Take it easy.    B. Don’t worry   C. I hope so.

Mom, don’t worry ______me. I can take care of myself.

????????????? A. about????????????? B. with????????????? C. for

—Excuse me，sir. The shoes are a bit small for me

     —Don’t worry．I’ll change them for a——size

    A smaller      B smallest    C larger      D largest