Hot metal ________ as it grows cooler.
A
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Howlong________they________(dig)theditch?
Wooddoesnotconductelectricity;________.
Ifound________toanswerallthequestionswithinthetimegiven.
Hardlyhadhefinishedhisspeech________theaudiencestartedcheering.
How long ________ they ________ (dig) the ditch?