重点语言点
1. Well, once they find people in need, they decide on suitable ways to help them.
他们一旦发现有人需要帮助，就选定适当的方式来帮助他们。
a) once 是从属连词，表“一旦……就……”,它的从句为现在时态(包括一般现在时、现在进行时、现在完成时)，主句则为一般将来时。或者主从句均为过去的某种时态。如：
Once you become interested in playing computer games, you’ll have trouble giving them up.
一旦你迷上了电脑游戏，你就很难放弃它。
Once he arrives here, he will know the whole thing. 一旦他到这儿，他就会知道整件事的。
She told him once she arrived, she would call him. 她告诉他一旦她到了，她会打电话给他。
b) decide on (doing ) sth. 决定（做）某事， 相当于 decide to do sth. 如：
They decided on spending the holiday in Hainan. 他们决定在海南度假。
= They decided to spend the holiday in Hainan.
2. The government provides homeless people with nice homes.
政府向无家可归的人们提供舒适的住处。
provide sb. with sth. = provide sth. for sb. 提供给某人某物
The school provided the students with food. 这所学校为学生们提供食物。
= The school provided food for the students.
3. I think it’s a wonderful place to live in. 我认为那是一个居住的好地方。
to live in 是动词不定式，用来修饰前面的名词place. 在不定式中，如动词为不及物动词，或者不定式所修饰的名词或代词是不定式动作的地点、工具等，不定式后必须跟上相应的介词。 如：
There is nothing to worry about. 没有什么可担心的事。
I need a pen to write with. 我需要一只笔写字。
4. It is famous because it has been so successful in helping homeless people return to normal lives.
它很出名是因为它已经成功地帮助无家可归的人重新过上正常的生活。
be successful in doing sth. 成功地做成某事， 相当于 succeed in doing sth. 如：
He was successful in passing the exam. 他成功地通过了考试。
They were successful in climbing Mount Huang. 他们成功地登上了黄山。
5．In the past sixteen years, Project Hope has raised about 3 billion yuan.
在近十六年来，希望工程已筹集了大约30亿元。
in the past + 若干时间，表“近若干时间来”，用于现在完成时。如：
They have learnt about 500 English words in the past two months.
近两个月来，他们已经学习了大约500个英语单词。
You have grown up a lot in the past three years. 近三年来，你们长大了许多。