your( )is very useful to the homeless people.
空格里要填的显然是名词；1和4是动词,2和3是名词.
3是捐赠人,2是捐赠或捐款.所以正确答案是2.
your( donation) is very useful to the homeless people.
对于无家可归的人,您的捐赠非常有用.
【英语牛人团】