I didn’t know this years ago ,but recent science ____that inharmonic marital(婚姻的) life like quarrels or fights harms one’ heart

(2013·安庆模拟)So far, what we have done is destroying the earth; only by changing　　　we live　　　we save it.

I’m sorry to keep you waiting.— It doesn’t matter. I ____ here for only a few minutes.

What’s the name？— Khulaifi. _____ I spell that for you？

Now there’s a system _________ the waste is disposed of using the principles of ecology.