--I hear Jack Chan will come to Laiwu next week. --Really? _______ he comes, my younger sister will be very happy,
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.