1. (2021八上·龙泉期末)  阅读下面短文, 回答问题。

The Shenzhou XIII mission was sent to October 16^th, 2021. The astronauts are Zhai Zhigang, Wang Yaping and Ye Guangfu. They planned to spend six months working in the space station. Early last month, Wang Yaping, 41, was China's first woman spacewalker in the space. 

They gave space-based classes from space station to students around the world. The astronauts showed the space station and their scientific experiments to the students, and showed some interesting physical phenomena to them.

On October 13^th, almost all students watched the space-based classes around China. It was the first time for Chinese students to have classes in this new way. It is a good way to make more young people be more interested in the space and study science and technology harder.

1. （1） How long will the astronauts stay in the space station?(not more than 2 words)
3. （2） Where did the astronauts give space-based classes ?(not more than 3 words)
5. （3） According to last paragraph, how are the space-based classes ?(not more than 3 words)