The terrorists might have planted a bomb on a plane in Athens,set to________when it arrived in NewYork.

He changed so much that only when I looked closely________he was exactly my long lost friend.

With a lot of difficult problems ________, the manager felt worried all the time.

As a result of the fight, Jim was in ________ prisonfor ________ years.

If you are feeling so tired, perhaps a little sleep would _____. [ ]