We won't go sightseeing if __________ tomorrow.
—Henry,________the light is ________when you leave the lab.—All right.
—________that middle school ________Beijing Normal University?—As far as I know,it is.
He opened the windows to ________ the smell of tobacco.
We don't have enough books for________;some of you will have to share.
Children should not be encouraged to ________the electronic dictionaries as it will make them lazier.