________ is known to all, China will be an _______ and powerful country in 20 or 30 years.
| A．That; advancing | B．This; advanced |
| C．As; advanced | D．It; advanced |
—Hey, you haven't been acting like yourself. Everything is OK?
—.
| A．Sure, it is | B．I'm fine, thanks | C．That's good | D．It's a pleasure |
Cheer up! Everyone may have periods in their liveseverything seems tough.
| A．which | B．where | C．when | D．that |
______ piano is her main focus, she's also great at guitar.
| A．Since | B．Once | C．Unless | D．While |
With the nuclear crisis worsening in Iran, the world's attention is fixed again onis called the Middle East.
| A．which | B．that | C．what | D．it |
-- I can’t believe that Jeff _______ have quarreled and fought with his boss.
-- Well, if one _______ ask for trouble, it just can’t be helped.
| A．would; will | B．must; may | C．should; must | D．need; dare |