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
We should try our best English well.
A. learn B. to learn C. learnt D. to learning
We should students computer games.
A. keep; from play B. stop; from play C. s
top;
from playing D. keep; play
– These tickets are useless. Can I ?
--Yes, but make sure you put them in the dustbin.
A. pick them up B. throw them away C. throw away them D. pick up them.
He said he would come to see us the next afternoon.
A. sometime B. some time C. sometimes D. some times
