根据句子提示，将所给的词填入恰当的位置。
1. expensive cheap
Amy’s computer is ________. It costs a lot of money.
My computer is ________, but it’s helpful.
2. big small
This ball is ________, but it’s not heavy (重的).
That ball is ________, but it’s very heavy.
3. beautiful helpful
This dress is very ________.
My computer is ________. I can send emails now.
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