Sorrysir,wedon'thavewineorbeer.Weareonlylicensedtosell_______drinks.
TheopportunitytoexploreandplayandtheencouragementtodosoCan________theperformanceofmanychildren．
Successfullearningisnota(n)________activitybutconsistsoffourdistinctstagesinaspecificorder
Thefloordoesnotlooksobadwhen________(sweep)clean.
已知a,b为常数，时为等价无穷小，求a,b.
