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Test # 25


1.
Choose an idiom to replace the expression in the brackets:
I think that our boss (has a secret plan) which we will discover later.

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  • Science Experiments Ideas

    Gas balance

    Fix two plastic bags to the ends of a piece of wooden beading about 18 inches long and let it swing like a balance on a drawing pin. Pour some bicarbonate of soda and some vinegar into a glass. It begins to froth, because a gas is escaping. If you tilt the glass over one of the bags, the balance falls.
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