2013福建福州)—Is James at home?—No,he________Ya’an to be a volunteer.A.has gone toB.has been toC.is going to
.He lives_______in the______village, but he is never_______.
Pollution is a serious problem. Scientists have _______ some good ways to save it.
We can’t put off _____ a plan .
I saw himwhen I passed by.
Some people plan to ______ a volunteer project to help the disabled children.