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Test # 20


1.
Choose an idiom to replace the expression in the brackets:
It (became my responsibility) to clean up after the meeting.

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  • Science Experiments Ideas

    Weather station

    Fix a dry pinecone on to a small piece of wood with sealing wax or glue. Stick a pin into one of the central scales and place a straw over it. Put the cone out of doors, protected from the rain. The straw moves according to the state of the weather. Fix up a scale.
    This simple hygrometer was built by nature. The pinecone closes when it is going to rain, to protect the seeds from damp. The outside of the scales absorbs the moisture in the air, swells up and bends a process which you can also observe with a piece of paper which is wet on one side.


    Chourishi Systems