—Why did he come back? —It is ______ he forgot to take his umbrella with him.
After gunshots fired on campus, there is a growing _________ about safety among teachers and students.
The book, ________ he lost yesterday, ________.
She got up ________ late that she missed the first two classes.
There are two buildings, ________ stands nearly a hundred feet high.
Some new oilfields ________ since 1976.