这个项目旨在帮助无家可归者。

The project is designed to ___aid the homeless.

他的希腊语知识在他的研究中帮助了他。

He was ___aided in his research by his knowledge of Greek.

富裕国家帮助较贫穷的国家是至关重要的。

It is essential for rich countries to ___aid the poorer ones.