–When _______ your mother _______ you that blue dress, Lucy?–Sorry, I really can’t remember. Maybe two or three weeks ago. A. will; buy B. does; buy C. did; buy
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.