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

―How soon ________ your brother ________ backfrom Guangzhou―In two weeks.

At the endof the day we can gather our guests to enjoy fine wine.— You seem tobe getting off the point. How is that _______ to this discussion

Would you mind letting me ______ your laptop for another two weeks?—-No problem.

Some students often fight with each other just because of small things in daily life．It is important for students to learn how to _____________each other．