2 Read the passage and answer te questions:

Many things around the house may be dangers to children. Carelessness may cause regrettable incident. Young children cannot indentify what is safe and what is unsafe. They can touch or take hold of everything that is within their reach. So, we must be careful and watchful. To them, drugs look like candy and they put these into theie mouthhing curious and childreelectrical sockets may be sometn may put their fingers into there hollow devices. We all know elctricity can kill!

Marbles are cuorful and look attractive and there may be thought to be edible. A child naturally puts what is in his hand inti his month. Matches and lihgters are also dangerous to phay with. It only takes one match to cause a fire.

Keep there things out of children' s reach. Some pointed or sharp objects like scissors, knives,screwdrivers,needles,ect are dangerous and may injure children. In our home, there are hidden dangers that we must be alert to.

1 Why do children put drugs into their mouth?

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2 Should we cover ecectricity sockets? Why or why not?

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3 Why do children put marbles into their mouth?

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4 Why must we keep matches and lighters out of children's reach?

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5 Why may scissors, knives, screwdrivers, needles,ect injure children?

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4 Fill in the blank with Must or HAVE TO

1 I am sleepy. I................. go to bed now

2 You really ............................. come and the see our new house one day

3 My son .................................... go to school on Sunday

4 My sister ................................. pratice the piano 3 hours a day

5 I ............................. read book. It is very interesting.

6 English children........................stay at home until they 16 years old

7 I............................. give him the money. He is in need of held

8 You ......................... keep the drugs out of children's reach

9 Her eyes are bad so the.................... wear glasses all the time

10 Tom.............................cook the meal because his wife is away

Giups mình với mình sắp phải nộp bài rùi

@Nguyễn Nhật Minh@

14 Tính :a) (x+2)(x^2+2x-9) ; b) (x^2y-6)(x^2-5) ; c) (x+y)(xy-4+y)

d) (x^2y^2-x+3/4)(x-1/2) ; e) (2x^n+1-3y^n).2xy(x^n+1-2y^n).3xy

Giups mình với mình đang vội lắm !Thank các bạn nha!

@Nguyễn Huy Tú @DƯƠNG PHAN KHÁNH DƯƠNG@Nguyễn Thanh Hằng@Akai Haruma@Phùng Khánh Linh

20 Cho x+y=5. Tính giá trị của biểu thức :

a) P=3x^2-2x+3y^2-2y+6xy-100

b) Q=x^3+y^3-2x^2-2y^2+3xy(x+y)-4xy+3(x+y)+10

19 a) Cho (a-b)^2+(b-c)^2+(c-a)^2=(a+b-2c)^2+(b+c-2a)^2+(c+a-2b)^2

Chứng minh rằng a=b=c

b) Cho a,b,c,d là các số khác 0 và

(a+b+c+d)(a-b+c-d)(a+b-c-d)

Chứng minh rằng a/c=b/d

9 Phân tích đa thức sau thành nhân tử:

a) 9xy^2-18x^2y ; b) 6x^2-2y ; c)7x(x-y)-14y(y-x)

d)7-x^2 ; e) 16+8x+x^2 ; f)1-27x^3

g) x^3-9x^2+27x-27 ; h) (x+2y)^2-16y^2 ; i) x^3-64y^3