1. These students have already done the homework.

----> The homework ...

2. Hoang lives in the country. It is so boring there.

----> Hoang wishes ...

We started learning English in 2005

----> We have ...

H = \(\frac{2x^2+2x}{x^2-1}+\frac{1}{\sqrt{x}+1}-\frac{1}{\sqrt{x}-1}\left(x>=0;xkhác1\right)\)

a) Rút gọn H

b) Tìm tất cả các giá trị của x để \(\sqrt{x}\)< H

They will make a birthday cake for their mother.

-> A birthday cake...

1. It's 3 years since i last saw Nam

-> i haven't ...

2. They are poor, they can't help us.

-> If they...

3. I'm so busy, so i don't have enough time to take care of my family.

-> I wish i could...

4. They will make a birthday cake for their mother.

-> A birthday cake...

5. I have never been here before.

-> It is the first time ...

" Learning English is very necessary " . Lan said

-> Lan said...

"Why do not you play soccer, Lan?". Nga said.

-> Nga suggested that Lan...

They will build this house this year

-> this house... built this year.

Hoa last met her friends 6 months ago.

-> Hoa hasn't... for 6 months

She has never been late for work before.

-> it is the first time...