Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
At our school, we ______ wear uniforms. It is a rule.
A.have to
B.don’t have to
C.might
D.might not

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Hiking the trail to the peak ______ be dangerous if you are not well prepared for dramatic weather changes.
A.should
B.might
C.shall
D.had better

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
We ______ forget our identity card when we are travelling.
A.could not
B.have to
C.need
D.mustn’t

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The book is optional. My professor said we ______ read it if we needed extra information for the essay. But we ______ read it if we don’t want to.
A.must / ought not
B.will / cannot
C.could / do not have to
D.can / should not

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
My dad ______ me with Lan, the girl living next door.
A.always compare
B.always comparing
C.is always comparing
D.has always compared

So sánh $ A=2016.2018.a $ và $ B={{2017}^{2}}.a $ (với $ a > 0 $ ) ta được kết quả
A. $ A < B $ .
B. $ A\ge B $ .
C. $ A > B $ .
D. $ A=B $ .

Phân tích đa thức $ {{x}^{3}}+3{{x}^{2}}-5x\left( x+3 \right) $ thành nhân tử ta được kết quả là
A.$ {{x}^{2}}\left( x-5 \right)\left( x+3 \right) $.
B.$ x\left( x+5 \right)\left( {{x}^{2}}-3 \right) $.
C.$ x\left( x-5 \right)\left( x+3 \right) $.
D.$ \left( {{x}^{2}}-5 \right)\left( x+3 \right) $.

Số giá trị $ x $ thoả mãn $ 5(2x-5)=x(2x-5) $ là
A. $ 3 $ .
B. $ 1 $ .
C. $ 2 $ .
D. $ 0 $ .

Phân tích đa thức $ 28{{a}^{2}}{{b}^{2}}-21a{{b}^{2}}+14{{a}^{2}}b $ thành nhân tử ta được
A.$ 7ab\left( 4ab-3b+2{{a}^{2}} \right) $.
B.$ 7ab\left( 4ab-3b+2a \right) $.
C.$ 7ab\left( 4ab-3b-2a \right) $.
D.$ 7ab\left( 2ab-3b+2a \right) $.

Biết $ a-2b=0 $ . Giá trị của biểu thức $ B=a{{(a-b)}^{3}}+2b{{(b-a)}^{3}} $ là
A. $ 1 $ .
B. $ 2a+b $ .
C. $ 0 $ .
D. $ {{(a-b)}^{3}} $ .