Theconclusionfromthestudyisnotdefinite;itisjust________.

Thereisalwaysareadymarket____SewingMachines,providedtheyare___goodqualityandcompetitiveinprice.

PoorspeakerofEnglishthoughhewasatthetime,hestillmanagedtomakehimself________.

Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.

Accordingtothe"principles-and-parameters"theory,"principles"refertohighlyabstractpropertiesofgrammarwhichareappliedtolanguageingeneralandwhichgeneratephrasesandatthesametimerestrainthepowerofMovea,while"parameters"allowgeneralprinciplestooperateincertainrestrictedways,accordingtowhichparticulargrammarsofnaturallanguagesvary.