2 . Considering Grandma Joy was 85, Brad knew it was impractical. To get to the park, they would have to drive 500 miles through the night and it would be the first time in her life she’d _______ and slept outdoors.

Though Brad knew he was crazy, he still called his grandmother and asked her for _______. In the long _______ that followed, Brad expected, for all the right reasons, that it just wasn’t _______. But the old lady _______ him by asking, “When do we leave?”

They arrived at the campground at around 1:30 am in the middle of a rainstorm. Brad tried to _______   the tent. Finally they climbed inside successfully. It reminded him that when he was _______ , his grandmother did everything   _______ with him together.

The skies cleared the next day, and they set off. When they crossed a ravine(溪谷), he would held her hand to avoid _______ on the wet path. She moved ________ with the pace of an 85-year-old woman. They walked slowly. When some people passed her, Brad asked if she wanted to ________.

“I won’t give up even if it is ________ for me,” she told Brad. When they finally got to the top, the hikers gave her a big round of ________. That night Brad made a campfire. He and his grandmother sat next to each other, feeling the warmth and looking at stars. Brad and Grandma Joy opened the box of their ________. They talked about families, about loss, pain and regret and about what had happened.

“Here I had the opportunity to ________ with my grandson,” she said. “I thanked him. I had tears in my eyes. But they were good tears.”

3 . The part of the environmental movement that draws my firm’s attention is the design of buildings. Today, thousands of people come to ________ building conferences, and the idea that buildings can be good for people and the environment will be increasingly ________ in years to come. Back in 1984 we discovered that most manufactured products for decoration weren’t designed for ________ use. The “energy-efficient” sealed commercial buildings constructed after the 1970s energy crisis ________ indoor air quality problems caused by materials such as paint, wall covering and carpet. So for 20 years, we’ve been looking for ways to make these materials ________   for people and the planet.

Home builders can now use materials, such as green paints, that release significantly ________   amounts of chemical compounds, which people believe don’t ________ the quality of the air.   ________, our basic design strategy is focused not simply on being “less bad” but on creating ________ healthful materials that can be either safely returned to the soil or ________ by industry again and again. For example, the world’s largest carpet manufacturer has already ________ a carpet that is fully and safely recyclable.

Look at it this way: no one ________ to create a building that destroy the planet. But our current industrial systems are basically causing these conditions, whether we like it or not. So   ________ of simply trying to reduce the damage, we are ________ a positive approach. We’re giving people high-quality, healthful products and an opportunity to make choices that have a ________   effect on the world. It is not just the building industry, either. Entire cities are taking these environmentally positive approaches to design, planning and building.

4 . The bell rang. Jacob smiled and he was glad his math class was _______. He grabbed his lunch bag out of his backpack and looked inside. He blinked. Beside his usual lunch, there was an envelope. Jacob opened it and slid out a (n) _______. It was of a suitcase. Jacob _______ what it meant.

The next day at lunchtime Jacob opened his bag. A new envelope peeked out. Inside was a tiny toy _______. Now he was _______! When he got home, he asked his mother, “Are we taking a plane somewhere?” She just _______ at him, her eyes sparkling. “I guess it’s a mystery(谜)” was the only _______ she gave him.

Over the next few days, Jacob _______ more: a small American flag, a leaf from a palm tree and _______ a juicy orange. Then one day, when he finally got to open his lunch bag, there was ________ in it except for his usual lunch. His heart sank. Maybe he had been wrong after all. Maybe there was no trip. He was very ________.

Just before the end of the day, the school secretary handed Jacob a small box. “This is for you and ________ your mother outside.” He opened the box. A smile slid across his face. He ________ and pulled out a small black hat with two round mouse ears.

He hurried down to the main school doors where his mother and father were waiting, with suitcases. “We’re going to Disney World, right?” Jacob couldn’t contain his excitement. “Mystery ________,” laughed his mother. “Come on, we’re headed to the ________!”

5 . Like many young people, Jessica wants to travel the globe. Unlike most of them, this 25-year-old is doing it _______ . She and her husband have spent the last two years traveling the world, stopping everywhere from Paris to Singapore. It might sound like one long, expensive _______ , but the couple has an unusual way to make their travel _______ .

They’re part of a new form of the _______ economy: an online group of house sitters. Throughout their no-cost stays in _______ homes, they feed pets and water plants in the homeowner’s _______ .

It’s not all sightseeing. The two travelers carefully _______ their trips, scheduling their days around the pets that are sometimes difficult to _______ . But house sitting also offers a level of _______ they can’t find in a hotel. “It’s like ________ at a friend’s house,” Jessica says.

The couple has a high ________ rate in getting accepted as house sitters and they always go beyond the homeowner’s ________ . For Jessica, that means ________ plenty of pictures of happy pets, keeping the house ________ and leaving a nice small gift before heading to the next house. “You want to make the homeowner feel that they made the right ________ ,” she says.