初二英语同义句转换，急急急！只限今晚~

Question

1.I diden't go swimming because it rained last Wednesday.
I diden't go swimming _____ _____ the rain last Wednesday.
2.The cause of the fire is still .
It's still unknown _____ _____ the fire.

Answer 1

1.because of 后接短语
2.what causes 宾语从句

P.S."diden't"为didn’t

Answer 2

1.because of
2.what causes