例句： They did so under the mask of charity.

例句： Scientists have unlocked the secret of the atom.

例句： Older people may seek their own friends rather than become too emotionally dependent on their children.

例句： His imperious look makes us angry.

例句： Here you should use plural pronoun.

例句： I found it hard to identify with any of the characters in the film.

例句： The snake coiled itself around the tree.

例句： We would rather die than surrender.

例句： She passed me a skein of wool.

例句： He lives in a house among the trees.