Expertshavefoundthatnormalsleepcanbedividedintofive______stages
Studentsshould（）theirowninterestsaswellasdotheirschoolwork.
簡述一般商品流通和資本流通的區別。
Therediscoveryofthisspeciesofbirdsisoneofthemost___(ordinary)scientificfindingsinrecentyears.
Whenwereturnedfromourvacation,ournextdoorneighborswere______anewgaragebuilt.
