Pollution is a serious problem. Scientists have _______ some good ways to save it.

I don’t know how ________this computer.

It is so crowded Where is Jack—He is very tall We can easily _____ himin the crowd

His efforts to raise money forhis program were________because no one showed any intention totake a cent out of their pockets[ ]

If you have any trouble, be sureto call me. —- _______.