下列各组中的两个单项式能合并的是（     ）

     There are two days we shouldn't worry about in our life. One is yesterday,____  Yesterday is gone forever.____ So it is useless to worry about it.  We cannot control tomorrow.____ maybe something good or bad. No matter tomorrow is sunny or cloudy, the sun will rise as usual.  So we have only one day left. What is it?____Today is the most important for everyone. It is the only day for us to fight for ourselves. We can control it. We can choose what to do and what not to do. We can choose how to do it. Treasure Today,____

阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

For many years, volunteers, both young and old, have been helping the poor and elderly people of this area. They work long hours building wheelchair paths, fixing leaky(有漏洞的) roofs and repairing the homes of those____ need help. Their only payment is the happy smiles and grateful hearts of the people whom____have helped.

I will always remember one man in particular____he has a real enthusiasm for voluntary work. He seemed to have inspired all the people in his group with his____(cheer) spirit. Every day when I asked him____he was doing, he would reply, “I'm doing good!”____the end of the month as he was preparing to leave, I looked at all the homes he ____(fix) and had to agree that he was indeed doing____good job!

A nice house, a successful career, and a lot of money might be nice to have, but____(compare) with fixing others' home and helping those who are in need, their____(significant) is not so great.