Rút gọn biểu thức : $\left(\frac{2}{\sqrt{x}-1}-\frac{5}{x+\sqrt{x}-2}\right):\left[1+\frac{3}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+2\right)}\right]$

ĐKXĐ của biểu thức trên là 

y=tan⁡(3x+π/4)

 VI  Put the verbs into the correct tenses.

      1.   If he (be able to turn) …………….back to childhood, he (spend) …………….. more time with his friends.

      2.   The ship (swallow) …………….. by the sea before the rescue team (come) ……………

      3.   By 9 p.m last night, I (accomplish) ……………..my essay writing on tourism.

      4.   They asked what I (do) ………….. if I (be) …………….. there during that hurricane.

      5.   Can you come over my house after 9 a.m. tomorrow? I (go) ........... out until 8.45 a.m.

IV  Fill in the blank with a suitable word or phrase given in the box. There are 2 extra words.

      1.   A new improved ……………… has just been launched to serve the new space project of NASA.

      2.   I must learn English well before going study in England to avoid ………………  

      3.   Many people died of ……………… in the severe drought in the last decade.

      4.   Advancements in science and technology have helped increase people’s ...................

      5.   The path of a celestial body in its revolution about another is called ………………

hãy tả ước mơ trở thành nhà khoa học của e 

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