He couldn’t continue to live such a poor life, so he left home, ____ not to come back if he couldn’t get rich.

-- Could you give these books to Mr. Mackintosh?-- Certainly, ______ him about something else in any case, so it won’t be any bother.

All possible means ____ to prevent the air pollution, but the sky is still not clear. 

-Is your father a teacher of English in the No.l Middle School?-No! But he _________ English there for ten years.

His experiences as a volunteer in the quake-hit areas have changed his attitude toward society and _______ influence his future life．