How to use "conceal" in a sentence

A few evergreen shrubs were clustered near the house, but none was of sufficient size to conceal a man

It was Jacklin's job to conceive new welfare programs, convince the Secretary of Health and Welfare that those programs were needed, sell them to the Congress, and then establish convincing bureaucratic shells to conceal the fact that the programs were utterly phony; and as federal funds flowed to these false-front operations, the money was diverted to the Network

"Well," Tina said, unsuccessfully trying to conceal her own anxiety, "we didn't need the snowshoes after all."