Choose the best answer to complete the sentence.
Our parents …………….workers in the factory since we were small kids.
A.have been
B.are
C.were
D.will be

Choose the best answer to complete the sentence.
My father…………….for the car factory since 1995.
A.is working
B.worked
C.has worked
D.was working

Choose the best answer to complete the sentence.
As soon as I arrive in New York, I……………. you.
A.to phone
B.phone
C.will phone
D.phoned

Cho $ \int\limits_{-1}^{1}{f\left( x \right)dx}=30 $ và $ \int\limits_{-1}^{1}{g\left( x \right)dx}=5 $ . Khi đó $ \int\limits_{-1}^{1}{\left[ f\left( x \right)-2g\left( x \right) \right]dx} $ bằng
A. $ 24 $ .
B. $ 20 $ .
C. $ 25 $ .
D. $ 40 $ .

Chọn khẳng định sai:
A.$\int\limits_{a}^{b}{f(x)dx=\int\limits_{b}^{a}{f(x)dx}}$
B.$\int\limits_{a}^{b}{kf(x)dx=k\int\limits_{a}^{b}{f(x)dx}}$
C.$\int\limits_{a}^{b}{f(x)dx=\int\limits_{a}^{c}{f(x)dx}}+\int\limits_{c}^{b}{f(x)dx}$ $\left( c\in \left( a;b \right) \right)$
D.$\int\limits_{a}^{a}{f(x)dx=0}$

Nếu $f\left( 2 \right)=-5,f'\left( x \right)$ liên tục $\left( 0;+\infty \right)$ và $\int\limits_{2}^{5}{f'\left( x \right)dx}=3$ thì $f\left( 5 \right)$ bằng
A.\(8\)
B.\(-8\)
C.$2$
D.$-2$

Cho $ f\left( x \right) $ và $ g\left( x \right) $ là các hàm số liên tục bất kì trên đoạn $ \left[ a;b \right] $ . Mệnh đề nào sau đây đúng ?
A. $ \int\limits_{a}^{b}{\left| f\left( x \right)-g\left( x \right) \right|\text{d}x=\int\limits_{a}^{b}{f\left( x \right)\text{d}x-\int\limits_{a}^{b}{g\left( x \right)\text{d}x}}} $ .
B. $ \int\limits_{a}^{b}{\left( f\left( x \right)-g\left( x \right) \right)\text{d}x=\left| \int\limits_{a}^{b}{f\left( x \right)\text{d}x-\int\limits_{a}^{b}{g\left( x \right)\text{d}x}} \right|} $ .
C. $ \int\limits_{a}^{b}{\left( f\left( x \right)-g\left( x \right) \right)\text{d}x=\int\limits_{a}^{b}{f\left( x \right)\text{d}x-\int\limits_{a}^{b}{g\left( x \right)\text{d}x}}} $ .
D. $ \left| \int\limits_{a}^{b}{\left( f\left( x \right)-g\left( x \right) \right)} \right|\text{d}x=\int\limits_{a}^{b}{f\left( x \right)\text{d}x-\int\limits_{a}^{b}{g\left( x \right)\text{d}x}} $ .

Nếu \(\int\limits_{0}^{2}{f\left( x \right)}dx=4\) và \(\int\limits_{0}^{2}{g\left( x \right)}dx=-2\) khi đó \(\int\limits_{0}^{2}{\left( 2f\left( x \right)-g\left( x\right) \right)dx}\) có giá trị là
A.$10$
B.$-8$
C.$12$
D.$-13$

Cho $\int\limits_{0}^{5}{f\left( x \right)dx}=12$ và $\int\limits_{-5}^{7}{f\left( x \right)dx}=4$ . Giá trị của \(I=\int\limits_{-5}^{0}{f\left( x \right)dx}+\int\limits_{5}^{7}{f\left( x \right)dx}\) bằng
A.\(8\)
B.$-8$
C.$16$
D.\(-16\)

Cho \[ \int\limits_{1}^{5}{f\left( x \right)dx}=6 \] và \[ \int\limits_{1}^{5}{g\left( x \right)dx}=8 \] . Giá trị của \[ \int\limits_{1}^{5}{\left[ 4f\left( x \right)-g\left( x \right) \right]dx} \] bằng
A.$12$.
B.$10$.
C.$16$.
D.$14$.