(2013·安徽，21)From space, the earth looks blue.This is ________about seventy－one percent of its surface is covered by water.

The international agreement, _____ encourage children not to smoke and help people kick the habit, was signed on February [ ]

goodness, you are here ! What____ you —- Traffic jam

Ted, Could you please________thetrash? —Of course, Mom.

It was playing computer games that _______the boy plenty of time that he ________ doing his lessons