请根据中英文提示或句意，写出句中所缺单词，使句子通顺。
---Why is the shop closed?
---It is open every day _______ Monday. You’d better go to another one.
Everybody knows black is the ________ of white.
He moved to another flat three _______( a group of building with streets on all sides) away from here.
When we talk with others in English， please be careful to _______(try not to do something) subjects like age， weight of money.
The big fire spread quickly and the firemen _______(设法) to put it out.