You_______ play with fire, Tom. It's dangerous.

You      remind him to keep things neat and tidy, because he is well organized. 

 --- What’s the weather like? --- Pretty hot and wet in the summer, but it _____ be quite cold in the winter. 

—The party was a great success. Why didn’t you come?   —I wish I_______. 

—Show me your permit, please.—Oh, it's not in my pocket. It ________.