— Mum my friends are waiting for me outside. May I go out to play with them?— Yes you

问题补充：

— Mum, my friends are waiting for me outside. May I go out to play with them?

— Yes, you , but be careful, please.

A. shall

B. must

C. may

D. should

答案：

A. shall

B. must

(答案→)C. may

D. should

解析：A. shall 将会 B. must必须 C. may 可以 D. should应该；句意：妈妈，我的朋友们正在外面等我，我可以出去和他们玩吗？是的，你可以，但是请小心点。故选C