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

A.\(\dfrac{{3\sqrt 6 }}{8}\)
B.\(\dfrac{9}{{\sqrt {141} }}\)
C.\(\dfrac{{\sqrt {15} }}{9}\)
D.\(\dfrac{{\sqrt {10} }}{8}\)

A.\(0\)
B.\(1\)
C.\(2019\)
D.\(2020\)

A.\(2007\)
B.\(2021\)
C.\(2019\)
D.\(2022\)

A.\(\dfrac{{3{a^3}}}{{16}}\)
B.\(\dfrac{{9{a^3}}}{{16}}\)
C.\(\dfrac{{9{a^3}}}{{32}}\)
D.\(\dfrac{{3{a^3}}}{{32}}\)

A.\(\left( {1;2} \right)\)
B.\(\left( {2;3} \right)\)
C.\(\left( {3;4} \right)\)
D.\(\left( {0;1} \right)\)