Without the earth’s atmosphere to protect them, astronauts can be exposed to intense radiation from the sun, ____ them at risk of cancer.
The enemy troop could hardly make any advance, and ________ could they fall back.
You can’t imagine the hard time he had ______ the horse in.
—Mary,new copies of Harry Potter are on sale now. —Great! Let’s go and buy______this afternoon.
—I’ve lost the game again. —______! It’s not that bad!
————.the website of www.google.com, and you will learn a lot about Obama’s first official visit to China.