例句： The dark room was momentarily lit up by a vivid flash of lightning.

例句： The flaw in this vase makes it less valuable.

例句： You might do me a favor?

例句： We prefer to eat out.

例句： My one good suit is at the cleaner' s.

例句： A good salesman must be aggressive if he wants to succeed.

例句： I don't want to go to the party but I'd better put in an appearance, I suppose.

例句： He made a resolution to read something profitable for one hour every day.

例句： the laws of nature.

例句： I wish I could be a fly on the wall when they discuss my future.