form the moon, our earth with water .seventy percent of its surface, appears as a blue ball.
--Can a plane fly ________ the Atlantic Ocean? --Yes, but it needs to go________ the clouds for hours.
The room ___________ window is open is mine.
Don’t turn on the radio __________ your mother allows you.
He devotes ________to ________.
Only when it is hungry ______ a human being.