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—Can you go to the Science Museum with me tomorrow?

—_________But I have to study for my math test.

 —What good weather! Let’s go boating on the lake. 

—__________.

A．That's all right                          B．Thank you very much

C．It doesn't matter                        D．That's a good idea

---I’m taking a walk after supper.---________________.

—My grandma is ill in hospital. I have to look after her.  —__________.

 --- I’m sorry for stepping on your foot.

--- ______.

A．That’s all right                         B．No, it’s my mistake

C．You didn’t hurt me at all                 D．Yes, don’t worry about it