1 . 今年春季我国所有学校推迟开学的原因是新冠病毒在全球爆发。
___ ___ ___ all schools in our country delayed opening this spring is ___ the novel coronavirus broke out all over the world.

2 . The main reason ________ monarch butterflies are endangered is ________ lots of places ________ used to be home to them have been seriously destroyed.

A．why; because; where	B．that; because; where
C．why; that; that	D．why; that; where

3 . 我们之所以选择这部电影，是因为它代表了我们学校的发展，这不仅有趣，而且有意义。
The reason _____we choose this movie is that it represents the development of our school, which is not only interesting but also meaningful.

4 . 他缺课的原因和你向我解释的不一样。
___________________was different from what you explained to me.(reason后接定语从句的用法)