4, Being always willing to help people, they consider him a helper.

5, Having drunk too much, Emily couldn’t remember the way to her home.

6, Having occurred in every part of the world, the global warming impacts people’s lives.

7, Having used different fertilizers and different stock feeds, these farmers succeeded in reducing farming’s contribution to climate change.

8, Having helped her mother do some housework, the girl joined the volunteer group to collect the garbage in her neighborhood.

9, Having found no one at home, Jo decided to turn off the air conditioner.

10, Having littered trash indiscriminately, people have polluted the environment unintentionally.

11, Having finished my homework, I went out for a drink with friends.

12, Having put every piece of waste paper in the rubbish bin, the little boy could raise people’s awareness of protecting the environment from a childhood.

13, Having dumped its chemical waste in the southern river, the factory killed tons of fish.

14, Having decided to invest in environmental protection progress, American government considered choosing Vietnam.

15, Having introduced a new solution to reduce water pollution, Vietnam get the world surprised.

D. Writing

1, Rivers have been overexploited, causing tremendous pressure on the livelihoods and water sources of the communities living on the riverbanks.

2, The cause of the climate change is increasing quantity of greenhouse gases produced in the atmosphere by human activities.

3, The majority of carbon dioxide emissions is from the burning of man-made fossil fuels.

4, Global warming has been damaging the Earth’s climate as well as the physical environment.

5, There are many lines of evidence that clearly show that atmospheric CO2 increase is caused by humans.