aid

他申请了大学经济援助。

He applied for financial ___aid for college.

这个项目旨在帮助无家可归者。

The project is designed to ___aid the homeless.

她去帮助一个被困在车里的人。

She went to the ___aid of a man trapped in his car.

互动软件是一种有效的教学辅助工具。

Interactive software is an effective teaching ___aid.