Inthefuture,more______shouldbeplacedontheeducationoftheyoung.
A、crisisHumanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
Whenworkersareorganizedintradeunions,employersfindithardtolaythem________.
Thefarmerhadtowearheavybootsinthewinterbecausethefieldsweretoowetand________.
I'm______tograduateinthenexthalfoftheyear.
Theaddressbook________theemailaddressesofyourfriendsorgroupsofcolleagues.
