2 . Lots of people have trees to look at from their bedrooms, but my perspective（视角）is different. My name is Miranda Gibson. I have been living at the top of a tree_______60 meters for 449 days now. Some people might wonder_______on earth I would choose to do this.

Stretching out below me is one of Tasmania's last areas of ancient forest---in an area that was proposed for World Heritage protection, yet remains under the_______of industrial logging（砍伐）. On 12 December 2011, machinery（大型机械）rolled into the forest and the destruction began. I couldn't_______the thought that these forests would be_______forever. So, on 14 December 2011, I packed up my life,_______of my job plans, and climbed 200 feet onto the top of this tree. I have been here ever since.

People often ask me what I do up here all day. It's busier than you would imagine. Like an office job, but with a splendid_______! I spend my days writing about this forest and its urgent（紧急的）need for_______on my blog.

Life in the treetops can be_______at times. I have times when I feel frustrated（沮丧）and wish I could________, to anywhere, just to have a change of scenery for a minute! There are also times when I feel terribly________. I miss my friends and family. My only connection to the outside world is my phone and computer, which I charge via solar panel.________these times, I find myself loving the experience. Living on the tree has been inspiring. I am willing to________up here for as long as it takes, but I honestly hope it won't be too________before I will be able to get down and put my feet on the ground in a forest that is no longer under threat—in a forest that will be________guarded for future generations.

3 . In this age of environmental crises, perhaps it comes no surprise that Stella Bowles found one in her own backyard. What is unique is her_______to do something about it．

The 100-kilometre LaHave River passes through Stella's community of Upper LaHave. Back in 2015, the pretty waterway was considered by many locals_______ to swim in，but Stella wanted to know_______.The then 11-year-old was_______ to learn what was causing the pollution: human waste being cast_______into the water by hundreds of her neighbors．

"I was _______ , " Stella says, when she found out 600 homes were using straight-pipes to pump waste from toilet to river without any filtration（过滤）. She decided to _____the problem for her Grade 6 science project. With the help of a retired local physician, Stella learned how to_______ the water in the LaHave. _______, her results showed contamination （污染） way above Health Canada guidelines. _______ , locals were boating on the river without knowing they were ______the potential danger of infection．

Stella began to raise _______ about the LaHave's contamination problem. Soon she was making local headlines and trying to _______politicians．Finally，in spring 2017， all levels of governments _______ to remove all straight-pipes in Nova Scotia by 2023．

The LaHave _______isn't safe for swimming, but it should be safe for the sixth graders of Upper LaHave's future. Stella, now 14, continues to _______ more rigid rules to protect the river and this year travelled around her province to teach other kids how to test their local waterways and _______ for better care．

In August, thanks to her excellent work，Stella_______ an International Eco-Hero Award, which _______ the efforts of environmental youth activists. "I never thought I'd be where I am today _______ a science project，" says Stella, who is considering a career in environmental law．

4 . I fell in love with Yosemite National Park the first time I saw it, when I was 13. My parents took us there for camping. On the way out, I asked them to wait while I ran up to E1 Capitan, a ________ rock of 3,300 feet straight up. I touched that giant rock and knew ________ I wanted to climb it. That has been my life’s passion (钟爱) ever since--- ________ the rocks and mountains of Yosemite. I’ve long made Yosemite my ________.

About 15 years ago I started seeing a lot of ________, like toilet paper, beer cans, and empty boxes, around the area. It’s ________ me why visitors started respecting the place ________ and treated such a beautiful home-like place this way.

I tried ________ trash(垃圾)myself, but the job was too big. I would ________an hour or two on the job, only to find the area trashed all over again weeks later. Finally, I got so _______ it that I decided something had to change.

As a rock-climbing guide, I knew ________about organizing any big event. But in 2004, together with some climbers, I set a date for a ________. On that day, more than 300 people ________. Over three days we collected about 6,000 pounds of trash. It was amazing how much we were able to ________. I couldn’t believe the ________ we made ---the park looked clean!

Each year volunteers come for the cleanup from everywhere. In 2007 alone, 2,945 people picked up 42,330 pounds of trash and ________ 132 miles of roadway.

I often hear people ________ about their surroundings. If you are one of them, I would say the only way to change things is by ________ rather than complaining. We need to teach by ________. You can’t blame others ________ you start with yourself.