From space, the earth looks blueThis is ____about seventy-one percent of its surface is covered by water

That hero who died in the war was so brave that he never ______ to the enemies until death.

I’m sure that middle school students will benefit ________ taking exercise every day, which is ________ great benefit ________ their health[ ]

－How did it that the secretary knew where we were?－Maybe he had been following us.

I didn’t mehelp________one.