—Shall we go out for a swim?

—Sorry, I can’t. I ______ housework for my mother now.

A. am doing　　　 B. is doing　　　 C. are doing　　　　 D. did

 ----Shall we go out for a picnic tomorrow?  ---- ____________.

       A. Yes, we shall.    B. No, we shan’t.     C. Let’s go.     D. Good idea.

—Shall we go out for a swim?

  —Sorry, I can’t. I ______ housework for my mother now.

  A. am doing       B. is doing        C. are doing         D. did

一Shall we go out for a trip to relax ourselves after the final exam?

A. That’s all right.                        B. It doesn’t matter.

C. That’s a good idea.                     D. Have a great time.

— Shall we go out for a walk?
— Sorry. This is not the right _______ to invite me. I am too tired to walk.