He ____ the cave before the police arrived, but he failed.

you are fined for speeding. Please sign here.— Fined Speeding ______

The population of Africa is ________ so rapidly as to cause concern of the whole world.[ ]

How can you expect him to make any progress ________ you never give him a chance to have a try?

The teacher frowned ___ annoyance when a studentfell asleep during his lesson.