Ababymightshowfearofanunfamiliaradult,_______heislikelytosmileandreachouttoanotherinfant.
A、ifTheTVstation,in________tomassivepopulardemand,decidedtocontinuethesoapopera(肥皂剧).
Thefarmerhadtowearheavybootsinthewinterbecausethefieldsweretoowetand________.
Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
Theenginehasbrokenandtheboatis______onthewater.
Iboughtthiseighteenthcenturywritingdeskataquite________price.
