As a volunteer of the 2012 London Olympic Games, which
sign
will you prepare to remind people to keep the environment clean?
A. 
B.
C.
D.
of the juice orange. It’s very pure.
A. Fourth five, are B. Four fifths , are C. Fourth five, is D. Four fifths, is
– has
he lived in Canada? --Since 1998.
A. How soon B. How far C. How long D. How often
Ann is looking forward to her new pen friend.
A. meet B. meets C. meeting D. Met
The maths problem is so difficult that none of them can .
A. work out it B. work it out C. find out it D. find it out
The foreigners have been in Beijing for three years, so they are familiar the city .
A. to B. with C. for D. On
