Not all birds can fly , ______ do all birds build nests.
A、notB
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I was shocked by the number of people who seemed to have nothing better to do with their timethan ______ to know fish better.
Those who change mobile phones too frequently will have to pay for being ______.
Mrs.Smithlockedboththefrontandthebackdoorsbeforeshewenttobed______thatsomeonemightstealintothehouseatnight.
We have to wait for the bus, ______?
Shewasso______thenoisethatshesentthechildrentobed.
