our earth, or else it will be no longer fit for us to live on.

I______of your trying to earn some money, but please don’t ignore your studies.

Oh， dear! What ______ so terrible—The food on the table goes bad. I’ll throw it away in a minute.

I will tell him the exciting news as soon as he ______ back.

It was 300 hundred years ago _______ this historictemple was built by a wealthy Mandarin