Everyone will go through life’s stages of ups and downs, ________ self-respect plays a key role in the maturity(成熟) of a person.

Professor Smith will come here to give a speech. Allthe preparations must be _____ before 5 o’clock.

His parents demanded that he ___________ to see them once a week.

下列词语中加线的字,读音全都不相同的一项是(　　)

－I can’t afford ________ a big house now. But I think I can in the future. －I agree with you.