It is imperative that students _____ their term papers on time.
A
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Thesmallmountainvillagewas（）bythesnowformorethanonemonth.
To obtain a satisfactory result ， one must apply two____of paint on a clean surface.
Prices have recently risen in order to __________ the increased cost of raw materials.
LastMarchthe__________ofa19thcenturycargoshipwasfoundbyanunderwaterarchaeologicalteam.