—This is the first time I_________ my first picture with my own hands.—It is time that you_________a picture for me.
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.
________ these experiments were successfully completed would we think of going into humans.