Mr. Green is funny. He often tells us jokes and makes us _______.

[      ]

A. laugh

B. cry

C. to laugh

D. to cry

----Thank you very much for giving me a hand when I was in trouble.

------Don’t mention it. I only did what anyone else _______ in my place.  

A．must do

B．might do

C．would have done

D．can have done