Answer:

ASK

AnswerCrossword Clue
ASK"Don't ..!"
ASKInvite
ASKKennedy quote starter
ASKMake a request
ASKPropose
ASKQuestion
ASK.. for it (seek trouble)
ASKCross-examine
ASKInquire
ASKJFK quote starter
ASKMake an entreaty
ASKPut it to someone
ASKQuery
ASKSolicit bids
ASKPop the question
ASKRequest
ASKSay "What?"
ASKShow curiosity
ASKWebsite that tries to install an annoying toolbar along with other programs
ASKPose
ASKStart of a Kennedy quote
ASKSend out invitations
ASKAnswer, on Jeopardy!
ASKSeek information
ASKTry to find out
ASKSay "May I?"
ASKRequire
ASKExpress a query
ASKPose a question
ASKSolicit
ASKWhat it doesn't hurt to do
ASK"Don't ..."
ASKAssume the role of interviewer
ASKAct as quizmaster
ASKSet a price
ASK....com (search engine)
ASK"Don't ...!"
ASKConsult an oracle, say
ASKSeek info, say
ASKSeek clarification