She ________ her nervousness to the importance of the interview.
D
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Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.
________,Johnhasbeentoseveralforeigncountries.
Othersarguethatsincetheearthhasenduredalongstringoficeagesinthelasttwomilliontothreemillionyears,anywarmingis________tobetemporary.
________they'vegottoknoweachotheralittlebetter,theygetalongjustfine.