Themanageriscallingona______customertryingtotalkhimintosigningthecontract．

Iwonderifhecouldgetit________(do)beforetomorrow.

设函数f(x)=ln(3x)，则'f(2)=（）

Successfullearningisnota(n)________activitybutconsistsoffourdistinctstagesinaspecificorder

Thedirectorrecommendedthatshe________(study)moreEnglishbeforegoingabroad.