Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
ItwasthreeBritishsportsmenwho________banneddrugs.
Iboughtthiseighteenthcenturywritingdeskataquite________price.
Shehadclearlyno________ofdoinganywork,althoughshewasverywellpaid.