This is______difficult problem that few students can work it out.
A.so B.so a C.such D.such a
.He lives_______in the______village, but he is never_______.
A.alone; alone; lonely B.alone; lonely; lonely;
C.lonely; alone; lonely D.lonely; lonely; alone.
Pollution is a serious problem. Scientists have _______ some good ways to save it.
A. come up with B. come on C. come out D. come up
We can’t put off _____ a plan .
A.make B. to make C.making D. to making
I saw him when I passed by.
A.ranB. to runC.runsD.running
Some people plan to ______ a volunteer project to help the disabled children.
A. put up B. think up C. set up D. cheer up
