大家都知道，如果路边的小屋上写有W.C.的字样，那大概就是一个可以方便的地方。请问W.C.的完整英语形式是什么

Remember me to your parents when you _____ them

It’s dangerous to walk across the street carelessly.—You’re right. We can’t be _________ careful while crossing the street.

Do you know about Los Angeles— Yes. It is the second largest city in _______.

.He could see the tall chimneys of the factory _________