A.every
B.several
C.each
D.some

A.becomes
B.has become
C.became
D.will become

A.was crossing / struck
B.had crossed / was striking
C.crossed / had struck
D.is crossing / strikes

A.that
B.how
C.which
D.what

A.will you do
B.will you be doing
C.will you have done
D.will you have been doing

A.was calling / are not / are
B.called / were not / were
C.had called / had not been / were
D.called / have not been / are

A.However
B.Although
C.In spite of
D.Therefore

A.has been
B.had been
C.was
D.were

A.\(\dfrac{{\pi {a^3}}}{{18}}\)
B.\(\dfrac{{\pi {a^3}}}{{54}}\)
C.\(\dfrac{{\pi {a^3}}}{{27}}\)
D.\(\dfrac{{2\pi {a^3}}}{{54}}\)

A.\(2\)
B.\(3\)
C.\(1\)
D.Vô số