As is known to all, Montreal is the second largest French-speaking city in the world, .
Not until all the fish died in the lake __________ how serious the pollution was.
A student at a Nevada middle school opened fire on campus, wounding two l2-year-old boys and__________ a math teacher.
It never will rain roses. __________ we want to have more roses. we must plant trees.
I really don’t know _________ I put my wallet after I paid the bill.
During the examination we are required to stay in our seats, keep our eyes on our work, ____ to anyone.