The threats to the health of astronauts in space are very different from __________ on earth.
—I’m afraid I can’t finish the book within this week. —Don’t worry. .
According to a UN report,one third of the world population have no to clean drinking water and health care.
Helen has got it takes to be a great tennis player. In other words, she has the potential to become world famous.
—When will the visas be ready, sir? —everything goes well, you should get them in 14 workdays.
Economic growth in the world remains weak throughout 2013 and it is hoped that it will gradually in 2014.