—Sorry，I can't go camping with you. I have to prepare well enough
for the entrance exam.
—________！We can camp together next time.
| A．Don't say so | B．Congratulations |
| C．Good luck | D．No problem |
Now Tom with his classmates ________ football on the playground.
| A．play | B．are playing | C．plays | D．is playing |
Half of the workers here ________ under 30 ________.
| A．is;years | B．are;year old | C．is;years old | D．are;years of age |
About 60 percent of the students ________ from the south,the rest of them ________ from the north and foreign countries.
| A．are;is | B．are;are | C．is;are | D．is;is |
He looked quite healthy though he was _________.
| A．in seventy | B．in his seventy |
| C．at seventies | D．at the age of seventy |
Everything is not in good order but _________.
| A．at six and seven | B．at sixes and sevens |
| C．sixes and sevens | D．on sixes of sevens |