It was not until midnight      they reached the camp site.

 She locked her room _____ a thief would break into it.

Tom was thinking about how to explain to the teacher why he was late for class, when a good idea _______him.

I would appreciate ________ much if you could write to me as soon as possible.

.Our boss suggested we clerks ______ good sales methods and his words suggested that ______ did the best ______ the best prize.