Sorry about posting these so late.  My wife's grandmother had a medical scare that necessitated our leaving town to be with her.  Thankfully, she pulled through. 

The answer to last Thursday's TTPK is "boy":  poster boy, boyfriend, tomboy.

The answer to last Friday's TTPK is "strip":  landing strip, crash landing, Knots Landing.

The answer to last Saturday's TTPK is "call":  phone call, last call, duck call.

The answer to last Sunday's TTPK is "limit":  time limit, speed limit, limitless.

Be Cool,

TS