由于恶劣天气，火车晚点了。

The train was delayed ___because ___of bad weather.

由于他的学习成绩，他总是和父母争吵。

He always had arguments with his parents ___because ___of his school results.

因为大雨，我们取消了野餐。

We cancelled the picnic ___because ___of the heavy rain.