A.I have not called her since January.
B.I have not called her for one month.
C.I have called her since January.
D.I had called her by January.

A.Maria advised Victor to open up and tell their teacher about his situation.
B.Maria forbid Victor to open up and tell their teacher about his situation.
C.Maria forced Victor to open up and tell their teacher about his situation.
D.Maria allowed Victor to open up and tell their teacher about his situation.

A.You can walk on the grass in the park if you want to.
B.People like walking on the grass in the park.
C.We must not walk on the grass in the park.
D.We do not have to walk on the grass in the park.

A.\(\int {f\left( x \right)dx}  = \dfrac{1}{2}{x^4} - 9x + C\)
B.\(\int {f\left( x \right)dx}  = {x^4} - 9x + C\)
C.\(\int {f\left( x \right)dx}  = \dfrac{1}{2}{x^4} + C\) 
D.\(\int {f\left( x \right)dx}  = 4{x^3} + 9x + C\)

A.\(x = 5\)
B.\(x = 12\) 
C.\(x = 9\)
D.\(x = 11\)

A.\(S = \left\{ {\sqrt 2 ;2} \right\}\)
B.\(S = \left\{ { - \sqrt 2 ;\sqrt 2 } \right\}\)
C.\(S = \left\{ { - \sqrt 2 ;2} \right\}\)
D.\(S = \left\{ { - 2;2} \right\}\)

A.\({a^{m + n}} = {\left( {{a^m}} \right)^n}\)
B.\({a^{m + n}} = \dfrac{{{a^m}}}{{{a^n}}}\)
C.\({a^{m + n}} = {a^m}.{a^n}\) 
D.\({a^{m + n}} = {a^m} + n\)

A.\(y' = {3^x}\ln 3\)
B.\(y' = \dfrac{{{3^x}}}{{\ln 3}}\)
C.\(y' = x{3^{x - 1}}\)
D.\(y' = {3^x}\)

A.\(\ln \left( {ab} \right) = \ln a + \ln b\)
B.\(\ln \left( {ab} \right) = \ln a.\ln b\)
C.\(\ln \dfrac{a}{b} = \dfrac{{\ln a}}{{\ln b}}\)
D.\(\ln \dfrac{a}{b} = \ln b - \ln a\)

A.\(\left( C \right)\) cắt trục hoành tại hai điểm.
B.\(\left( C \right)\) cắt trục hoành tại một điểm.
C.\(\left( C \right)\) không cắt trục hoành.
D.\(\left( C \right)\) cắt trục hoành tại ba điểm