Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If I ___________ to put my knowledge into practice, I ___________ more job opportunities now.
A.had been/ would have
B.had been/ would have had
C.have / will have
D.were/ would have

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If I ________ my knowledge with others, I would have had more close friends and supporters.
 
A.shared
B.share
C.had shared
D.would share

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
I am flying to the States tonight. I ______ you a ring if I can find a phone.
A.have given
B.would give
C.will give
D.could give

Giá trị $ \cot \dfrac{89\pi }{6} $ là
A. $ \dfrac{\sqrt{3}}{3} $ .
B. $ -\sqrt{3} $ .
C. $ \dfrac{\sqrt{3}}{3} $ .
D. $ \sqrt{3} $ .

Cho $ 0 < \alpha < \dfrac{\pi }{2} $ . Dấu của $ \cos \left( \alpha -\dfrac{3\pi }{8} \right) $ là
A. $ \cos \left( \alpha -\dfrac{3\pi }{8} \right) > 0 $
B. $ \cos \left( \alpha -\dfrac{3\pi }{8} \right) < 0 $
C. $ \cos \left( \alpha -\dfrac{3\pi }{8} \right)\ge 0 $
D. $ \cos \left( \alpha -\dfrac{3\pi }{8} \right)\le 0 $

Cho $ \tan \alpha =3 $ . Tính $ \cot \alpha $
A. $ -\dfrac{1}{3} $
B.-3
C. $ \dfrac{1}{3} $
D.3

Cho $ {cos }x=\dfrac{ {2}}{\sqrt{ {5}}}\,\,\,\left( -\dfrac{\pi }{2}<x<0 \right)$ thì $\sin x$ có giá trị bằng :
A.$\dfrac{\pi }{4} $.
B.$\dfrac{3}{\sqrt{5}}$.
C.$\dfrac{-1}{\sqrt{5}}$.
D.$\dfrac{-3}{\sqrt{5}}$.

Cho $ 0 < \alpha < \dfrac{\pi }{2} $ . Dấu của $ \sin \left( \alpha +\dfrac{2\pi }{5} \right) $ là
A. $ \sin \left( \alpha +\dfrac{2\pi }{5} \right)\le 0 $
B. $ \sin \left( \alpha +\dfrac{2\pi }{5} \right) > 0 $
C. $ \sin \left( \alpha +\dfrac{2\pi }{5} \right) < 0 $
D. $ \sin \left( \alpha +\dfrac{2\pi }{5} \right)\ge 0 $

Cho $ 0 < \alpha < \dfrac{\pi }{2} $ . Dấu của $ \tan (\alpha -\pi ) $ là
A. $ \tan (\alpha -\pi ) < 0 $
B. $ \tan (\alpha -\pi ) > 0 $
C. $ \tan (\alpha -\pi )\le 0 $
D. $ \tan (\alpha -\pi )\ge 0 $

Cho $\dfrac{\pi }{2}<\alpha <\pi $. Dấu của $\tan \left( \dfrac{3\pi }{2}-\alpha  \right)$
A.$\tan \left( \dfrac{3\pi }{2}-\alpha \right)\le 0$
B.$\tan \left( \dfrac{3\pi }{2}-\alpha \right)<0$
C.$\tan \left( \dfrac{3\pi }{2}-\alpha \right)\ge 0$
D.$\tan \left( \dfrac{3\pi }{2}-\alpha \right)>0$