Rewrite the sentences, using perfect gerunds:

1. After Ha had read some documents about Green Earth, she decided to join the organisation.

-> Having..........

2. I have seen him before. I remember that.

-> I......

3. You had saved the lives of hundreds of wild animals. Thank you for that.

-> Thank you for.......

4. They had hunted and killed many wild animals. Later they regretted what they had done.

-> They regretted........

5. Since Mai had refused Nam's offer of a lift in his car, she had to walk home.

-> Having.......

6. ' You've lied to us', the villagers said. The politician denied it.

-> The politician...........

7. The factory has dumped tons of toxic waste into the river. It was heavily fined for that.

-> The factory........

8. Thanh had forgotten to turn off the gas cooker before he left his house. He admitted that.

-> Thanh admitted..........

Phương trình : \(3sin3x+\sqrt{3}sin9x=1+4sin^33x\) có các nghiệm là : 

A . \(\orbr{\begin{cases}x=-\frac{\pi}{6}+k\frac{2\pi}{9}\\x=\frac{7\pi}{6}+k\frac{2\pi}{9}\end{cases}}\) 

B . \(\orbr{\begin{cases}x=-\frac{\pi}{9}+k\frac{2\pi}{9}\\x=\frac{7\pi}{9}+k\frac{2\pi}{9}\end{cases}}\)

C . \(\orbr{\begin{cases}x=-\frac{\pi}{12}+k\frac{2\pi}{9}\\x=\frac{7\pi}{12}+k\frac{2\pi}{9}\end{cases}}\)

D . \(\orbr{\begin{cases}x=-\frac{\pi}{54}+k\frac{2\pi}{9}\\x=\frac{\pi}{18}+k\frac{2\pi}{9}\end{cases}}\) 

Trình bày bài giải chi tiết rồi mới chọn đáp án nha các bạn .

HELP ME !!!!!!!!