Usually, we don’t know how important something is        we lose it.

Don’t forget to wash your hands        you have meals.

—Would you like to go for a walk with me, Alan?
—I’d love to,        you don’t want to go alone.

—What shall we do now?
—       it’s raining hard, let’s stay at home.

We should eat many fruits         apples and oranges.

They didn’t go to bed        they finished their homework.

Kelly Clarkson is so popular among young people         her beautiful voice.

My head teacher is very popular in our class         she is quite strict.

The doctors tried their best to save the patients’ life,        failed.

用所给词的适当形式填空(每空一词)
由于生病了，他没有去上学。
He didn’t go to school ____ ____ his illness.