________theconcerthadbegundidwerealizewhatasplendidshowitwasgoingtobe.
Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
ItwasthreeBritishsportsmenwho________banneddrugs.
Theboyranoutoftheclassroomwithouttheteacher's_______.
It'smore________tobuyaseasonticketifyoutraveleveryday.