You can never get a straight answer out of him. Which of the following is correct for the underlined word in the sentence?
--Will there be money in 100 years? -- ________. Everything will be free.
Their school days are busy and the children don’t get home _____7 o’clock p.m.
The little girl likes to _______ as an angel(天使), so she asks her mother to buy her lots of clothes.
We all know trees play an important role in _______up the air.
Lucy and Lily are twins, but they are different _____each other in many ways.
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