Millionaires are often very generous and a lot of their money to charities to help the poo

问题补充：

Millionaires are often very generous and a lot of their money to charities to help the poor.

A. give in

B. give up

C. give away

D. give off

答案：

A. give in

B. give up

(答案→)C. give away

D. give off

解析：本题的含义是百万富翁非常慷慨，把很多钱捐赠给慈善机构帮助穷人，give away表示捐赠的意思，符合本题的含义，故本题选C。