Americans eat ______ vegetables per person today as they did in 1910.
A、morethantwicemanyA
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Those who change mobile phones too frequently will have to pay for being ______.
Homingpigeonisusefulasa______carrierbecausewhentakenfromhome,itwillreturnatthefirstopportunity.
In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
JeansaresohotthesedaysthatbignamestarsappearonTVadvertisingfortheir______brands.
Hertalentandexperience______hertotherespectofhercolleagues.