People ______always be careful with fire， or it can be dangerous.

He kept smiling secretly and we were all wonderingthat made him so happy.

I’ll have my winter(冬天) vacation(假日) in Xiamen this year.–It’s a nice place. ____ your vacation.

_________shouldnotbeallowedtogooutatnight.

For the safety, everyone _________ obey the traffic rules when he is driving or walking.