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—When do you have maths today? —We have maths          half past ten this morning.
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in
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—Is your ball on the chair? — No. It’s _____the chair.
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on
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in
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under
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_____ fine mornings, old people get together and do exercise by the lake.
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At
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on
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To
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In
.Jane is better___ drawing pictures than her sister.
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to
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for
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in
It’s difficult for such a girl to swim ____ the river.
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cross
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across
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crossing
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crossed
_________ the help of man-made satellites, we can know what the weather will be like in the next few days.
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Under
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With
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Using
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By