填写单词 根据句子意思, 在空格中填写适当的单词, 使句子完整、正确。

Here are four seasons in a year — spring, ____ , autumn and winter.

Frank was ____ in 2000. He is fifteen this year.

It's 12:00 at noon. It's time for students to have____ in the dining hall.

To keep____ , you'd better exercise every day and eat more fruit and vegetables.

In China, many children are taken____ of by their grandparents in the village.

— I've ____ been to a water park before.

— Me neither.

What does John want to be when he____ up?

A boy ____  himself in P. E. class. The teacher and two students took him to the  hospital at once.

已知x=﹣1是一元二次方程x²﹣mx﹣2=0的一个根，求m的值和方程的另一个根．

对病句的修改不正确的一项是（   ）

单细胞生物个体微小，不能完成呼吸、生殖等复杂的生命活动。         （    ）