第一单词是first。first的例句：The first year provides students with a sound theoretical basis for later study（第一年为学生以后的学习奠定坚实的理论基础）。

first的例句：I spent most time on the first question（我在第一个问题上花的时间最多）；First try to do something that is within your scope（你先试着做一件自己力所能及的事）。