More and more rich people have promised to______ their wealth after death to help the poor and the disabled.

We know _____America is great not because it isperfect but because it can always be made better and _____ the unfinished workof perfecting the union falls to each of its citizens

下列各句中，表达得体的一句是

With the advances of technology, plastics have taken the place of many ______ materials.[ ]

He _______ the best person you had been expecting for the job, but who else _______?