The reason ____ (为什么这事情会这样)is now clear. I don't need to explain it once more.

Doyouknowthereason____hewaslate?

Believe it or not,I dont like the way ____ he spoke to me.

Asisknowntousall,theage_____childrencangotoschoolisseven.

Humanbeingsaresuperiortoanimals_____theycanuselanguageasatooltocommunicate.