READ THE TEXT THEN ANSWER THE QUESTIONS THAT FOLLOW.

A recevey investigation by scientists at the US Geological survey shows that strange animal behaviour might help predict earthquakes.Investigators found such occurences in a ten-kilometor radius of epicenter of a fairly recent earthquake.Some birds screeched and flew about wildly;dogs yelped and ran around uncontrollanly.Scientists believe that animals can perceive these environmental changes as early as several days before the mishap.

In 1976,after observing animal behavior,The Chinease were able to predict a devastating earthquake .Although hundreds of thousands of people were killed,The goverment was able to evacuate millions of the other people and thus keep the death too at a lower level.

a.What might help predict earthquakes?

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b.Did investigators find such occurences in a 12 kilometer radius of epicenter of a fairly recent earthquake?

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c.When were the Chinese able to predict a devastating earthquake after they observed animal behavior?

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d.Were only a few hundreds of people saved in that earthquake?

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FILL IN THE NUMBERED BLANK IN THE PASSAGE WITH ONE SUITABLE WORD FROM THE BOX.(WHY)

English is one of the most popular languages in the world.It comes second in the number of (1)........ after Chinese .In Vietnam,more and (2)..........people studying English.However,(3)....................... every one knows to learn English effectively.The best to(4)......................the four skills;speaking,listening,reading and(5)............is to practise regularly.

REWRITE THE SENTENCES.

1.Does she meet her old friends every weekend?

________________________her old friends________________________?

2.Study hard or you won't get good marks this semester.

__________________________________________________________.

3.I don't like the boy.He is sitting next to Lan.

I don't like____________________________________________.

4.Last week,we came to a beautiful place.My sister is working there.

Last week,we___________________________________________.

5.Tom gave me an English book.He bought it last week.

Tom gave___________________________________________________.

6.He was seriously ill.He tried to finish his project on time.(Although)

_______________________________________________________.

7.The world's energy resources are limited.We should use them ecconomically.

_______________________________________________________.

8.They don't go out with us.They don't have free time.(If)

______________________________________________________________.

Tìm x,y biết:

\(x+y=x.y=x:y\)(với \(y\ne0\))

Tìm x,biết:

\(\dfrac{315-x}{101}+\dfrac{313-x}{103}+\dfrac{311-x}{105}+\dfrac{309-x}{107}=0\)

Tìm x,y,z:

a/\(\dfrac{15}{x-9}=\dfrac{20}{y-12}=\dfrac{40}{z-24}\)và x.y=1200

b/15x=-10y=6z và xyz=30000

TÍNH:

\(S=\dfrac{1}{2.3}+\dfrac{1}{3.4}+\dfrac{1}{4.5}+...+\dfrac{1}{2017.2018}\)

Qua điểm O kẻ 4 đường thẳng phân biệt.

a/Hỏi có bao nhiêu góc tạo thành?Có bao nhiêu góc bẹt?

b/Có bao nhiêu góc đối đỉnh?

Cho \(\Delta ABC\) vuông tại A.Kẻ AH\(\perp\)BC.Tia phân giác của góc HAC cắt cạnh BC ở điểm D và tia phân giác của góc HAB cắt cạnh BC ở điểm E.Chứng minh hệ thức:AB+AC=BC+DE

Cho góc xOy.Trên tia phân giác Oz của góc xOy.Qua trung điểm B của OA,kẻ đường thẳng vuông góc với Oz,đường này cắt cạnh Oy tại điêm C.

a/CMR:AC//Ox

b/Tính góc xOy,biết góc ACO=130⁰