Two boys and their mother ___ under the tree.
A. are sleeping
B.is sleeping
C. are sleep
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Mary is swimming ___ the river.
A. to cross
B. crossing
C. across
Listen! Someone is ___ in the dark.
A. sing
B. singing
C. sings
— Excuse me. Who ___ eating the bones?— The dogs.
A. are
B. is
C. must
Is your brother ___ a book or ___ TV?
A. reading/looking
B. reading/watching
C. looking/watching