--If you need help, please don't hesitate to ask.

--OK. If I do, I'll ________ you to help me.

[　　]

If ________ , I'll come to your help at once. Don't hesitate ________ me.

1. A.
   needed, to call
2. B.
   needing me, calling
3. C.
   necessary, for calling
4. D.
   you need, to call

If ________ , I'll come to your help at once. Don't hesitate ________ me.

[　　]

— I have no question at the moment, sir.

   — Don’t ________ to call me if you need a hand. I’ll help you.

   A. wait                          B. hesitate             C. delay                       D. abandon

— I have no question at the moment, sir.

   — Don’t ________ to call me if you need a hand. I’ll help you.

   A. wait                          B. hesitate             C. delay                       D. abandon