—You seem tired, David.
—Yes. I _____ all day long and can’t wait to go to bed now.
| A．am working | B．had been working |
| C．have been working | D．was working |
He 1eft word with his secretary that she should keep it___ secret for_____ moment．
| A．the；the | B．the；a | C．a；不填 | D．a; the |
Of all the subjects,I like _________ history best because it gives us_________useful knowledge of things in the past.
| A．the;a | B．/;a | C．a;the | D．a;/ |
Liu Xiang is_________ first Chinese who has won_________ one-hundred-metre hurdle gold medal in the Olympic Games.
| A．the;a | B．the;the | C．the;an | D．a;the |
The report said a car went out of _________control on a highway _________south of the city and rushed into a river.
| A．the;the | B．/;the | C．the;/ | D．/;/ |
—Did you happen to see _________ black and _________ white cat?
—Is she missing?I told you to take care of her.
| A．the;the | B．the;/ | C．a;/ | D．a;the |