3.　 anyone else, let, if, know, collects, me, you, who, coins, please

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2.　 stuffed animals, nine, collecting, she, been, for, has, years

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1.　 raises, every hour, skate, for, for, they, charity, each, ten yuan, student

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10. How long have you been surfing the Internet? (6 hours)

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9.　 How long has Lucy been dancing in the room? (one and half hours)

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8.　 How long has Tim been swimming in the pool? (2 p.m.)

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7.　 How long have you been reading that book? (last week)

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6.　 When did she begin playing the piano? (9 o’clock in the morning)

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5.　 How long has she been playing the piano? (forty-five minutes)

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4.　 How long have they been studying English? (ten years old)

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