Though Mandela﹙曼德拉﹚____27 years in prison﹙监狱﹚, he thought it meaningful.

I think the older people must be _______ politely. —Yes. You are so kind.

Lily and Lucy are twins and Lucy is ________ of the two.

We carefully compared the result of the first experiment with_______ of the second one.

Your Chinese homework is good_____ your writing.[ ]