Grammar Test - by/until

Test # by/until


1.
We’d better wait ________ Tony's here.

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    Science Experiments Ideas

    Twin tumblers

    Light a candle stump in an empty tumbler, lay a sheet of damp blotting paper over the top and invert a second tumbler of the same size over it. After several seconds the flame goes out and the tumblers stick together.During combustion the oxygen in both tumblers is used up the blotting paper is permeable to air.Therefore the pressure inside is reduced and the air pressure outside pushes the tumblers together.

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