There are some birds_________ happily in the trees.A. sing B. are singing C. singing
—Who taughtFrench? —Nobody.She learned all by________.
-After trying five times, Carol finally passed her driving test. -After all, _______.
_______wonderful news report he wrote! All of us were proud of him.
Don't keep poison in the kitchen, _______?
We will wait until everyone_______ back.