Chọn câu sai.
A. $ {{x}^{2}}-5y+x-5xy=(x+1)(x-5y) $ .
B. $ {{a}^{3}}-4{{a}^{2}}+a-4=(a-4)({{a}^{2}}+1) $ .
C. $ {{x}^{2}}{{y}^{2}}+{{y}^{3}}+a{{x}^{2}}+ay=({{y}^{2}}+a)({{x}^{2}}+y) $ .
D. $ m{{x}^{2}}-nx-mx+n=(x-1)(mx+n) $ .

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions
Scientists are trying to find an energy that consumes less fuel.
A.eat up
B.waste
C.use
D.destroy

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Governments and scientists are worried about how to ______________ waste safely.
A.oppose to
B.pose
C.dispose of
D.give away

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions
Modern building are designed to maximize natural light.
A.diminish
B.absorb
C.let
D.increase

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
There is little _________ of things improving soon.
A.probabilities
B.probability
C.probably
D.probable

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_____________batteries or solar chargers are some of the solutions to the lack of energy.
A.repeatable
B.rechargeable
C.reversible
D.returnable

Chọn đáp án đúng
Điền chữ số thích hợp vào chỗ chấm
$ 4d{{m}^{2}}=...c{{m}^{2}} $
A. $ 40000 $ .
B. $ 400 $ .
C. $ 4000 $ .
D. $ 40 $ .

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
__________________is wiping out may kinds of plants and animals.
A.Deforestation
B.Deformation
C.Defoliation
D.Degradation

Đối với những vùng đất trống, đồi núi trọc thì biện pháp chủ yếu và cần thiết nhất là:
A.Tiến hành chăn thả gia súc
B.Trồng cây gây rừng
C.Cày xới để làm nương, rẫy để sản xuất lương thực
D.Làm nhà ở

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions
We have to suffer from traffic congestion and pollution every day
A.crowd
B.mass
C.accident
D.fullness