He went there, _____ some books and call on an old friend of his.
—Could I ask you a rather personal question? --Sure,_______.
.It is warned that no one is permitted______the lab after 10:00 p.m.
______has helped to save the drowning boy is worth praising.
.She listened with a________expression on her face,which suggested she didn’t completely understand.
The professor gave orders to the students that the rest ______ before 5:30.