Require
Part of speech: verb
Definition: To ask (someone) for something; to request. To demand, to insist upon (having); to call for authoritatively. Naturally to demand (something) as indispensable; to need, to call for as necessary. To demand of (someone) to do something.
Example sentence: Biofuels such as ethanol require enormous amounts of cropland and end up displacing either food crops or natural wilderness, neither of which is good.
Expect
Part of speech: verb
Definition: To look for (mentally); to look forward to, as to something that is believed to be about to happen or come; to have a previous apprehension of, whether of good or evil; to look for with some confidence; to anticipate; -- often followed by an infinitive, sometimes by a clause (with, or without, that); as I expect to receive wages; I expect that the troops will be defeated.to consider obligatory or required;to consider reasonably due;To wait for; to await.
Example sentence: I came in with Halley's Comet in 1835. It is coming again next year, and I expect to go out with it. It will be the greatest disappointment of my life if I don't go out with Halley's Comet. The Almighty has said, no doubt: 'Now here are these two unaccountable freaks; they came in together, they must go out together.'