The farmer had to wear heavy boots in the winter because the fields were too wet and________.
A、earthyD
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Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.
GeneralMotors,oneoftheworld'slargestautomanufacturers,isexpandingits________inthiscountry.
Theaddressbook________theemailaddressesofyourfriendsorgroupsofcolleagues.
Theassociationis________toraisingfundstohelptheblind.
Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
