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15. I can't buy it ________ such a price.

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14. -Are you ________ this proposal?

-No, I am ________ it.

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13. There's no smoke ________ fire.

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12. We have lessons every day ________ Saturday and Sunday.

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11. The satellites go ________ the earth and help us to learn more ________ the earth.

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10. My mother has been a teacher ________ 1986.

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9. You have to go ________ the bridge and then you can see the hotel ________ your left.

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8. Listen! Some birds are singing ________ the big tree.

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7. He gave me two tickets ________ Saturday's evening show.

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6. Their teacher is very strict ________ the students ________ everything.

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