Although he was_______ in a fierce fighting, he returned home _______.
| A．connected; safe | B．cautious; safely | C．involved; safely | D．involved; safe |
If our car had not ________, we would have been here on time.
| A．broken out | B．broken into | C．broken away | D．broken down |
This new kind of chemicals will help keep the air, soil and water________ from pollution.
| A．free | B．empty | C．loose | D．short |
Barack Obama has taken personal blame ________ the security failures which led ________ the attempt to blow up a plane on Christmas Day.
| A．of; to | B．for; to | C．on; on | D．in; on |
―Look! What a mistake! Why?
―Sorry, I _________ on it.
| A．don’t concentrate | B．hadn’t concentrated |
| C．haven’t been concentrating | D．wasn’t concentrating |
My father didn’t have to say anything. I knew he was upset from his ________.
| A．look | B．sight | C．appearance | D．sign |