货物是非贸易性商品，物品是贸易性商品。
错误
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Thankyouforyourhelp,_____wecouldnothavefinishedtheworkintime.
Hesetupinbusiness____hisownandwasverysuccessful.
LastFridayIsawsomeboys______behindDaniel,_____thecomputergames.
There'snodoubtthatthisisnottheway____Icamelasttime.
Hebuiltatelescope____hecouldstudytheskiesinhisfreetime.