Notallbirdscanfly,______doallbirdsbuildnests.
A、notB
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While crossing the mountain area, all the men carried guns lest they ______ by wild animals.
I was shocked by the number of people who seemed to have nothing better to do with their timethan ______ to know fish better.
Homing pigeon is useful as a ______ carrier because when taken from home, it will return atthe first opportunity.
______thepopularityofrobotsinJapan,thecountry’srobot-productiongrowthisslowingdown.
Mrs.Smithlockedboththefrontandthebackdoorsbeforeshewenttobed______thatsomeonemightstealintothehouseatnight.
