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1 to go => go
2 is => was
3 living=> lived
4 by => on
5 smoking => smoked
6 than => as
7 since => for
8 much => more
9 keeping => kept
10 mine => from mine
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8, were
9,don't hurry
10,doesn't spend
1, Lan is shorter than Trang
2,Lan isn't as tall as trang
3,Mr John is the best teacher in this school
4,My house is the smallest in the village
5,Learning Chinese is more difficult than learning English
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IV
1 by
2 on
3 at - in
4 to
5 for
6 with
7 into
8 of
9 in
V
1 carelessly
2 increasingly
3 protection
4 unresonable
5 preservation
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a, enough chairs
b,strong enough
c,enough time
d,well enough
e, big enough
f,enough qualification
g, warm enough
h, enough cups
i,experienced enough
j, warm enough
k,enough experience
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\(M=x^4-4x+7=\left(x^2-4x+4\right)+3=\left(x-2\right)^2+3\ge3\)
\(minM=3\Leftrightarrow x=2\)
\(P=x^2-6x+y^2-2y+12=\left(x^2-6x+9\right)+\left(y^2-2y+1\right)+2=\left(x-3\right)^2+\left(y-1\right)^2+2\ge2\)
\(minP=2\Leftrightarrow\)\(\left\{{}\begin{matrix}x=3\\y=1\end{matrix}\right.\)
1 C
2 D
3 B
4 A
5 D
6 A
7 A
8 D
9 B
10 C
IV
1 affected
2 practical
3 environmentalist
4 picnicking
5 outstanding
V
1 to have - built
2 broke - was being moved
3 doing - to answer
4 are -laughing - Have - been telling
5 will have finished
làm từ bài 5 thôi ạ