只有通過對當前系統進行詳細調查，才能為改進系統和開發高質量的新系統提供可靠的資料，為建立新系統的 _________模型打下堅實的基礎。
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Nowherebutintheremotestregionofthecountry____findaplacetosettledown.
MrsZhangoftentellsusthatspringisthetime____peoplegosightseeing.
Toobtainasatisfactoryresult，onemustapplytwo____ofpaintonacleansurface.
---Wouldyouliketogooutforawalkwithus?
---_____,butImustfinishmyhomeworkfirst.
____beforewedepartthedayaftertomorrow,weshouldhaveawonderfuldinnerparty.
