阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
The Unexpected Kindness Of A Stranger
Yesterday, as I approached the front door of our public library, a white-haired gentleman stepped back to hold the door for me. You see, I have to go everywhere these days with a walker, and folks are __________ (constant) holding or opening doors for me, so this was not unusual.
However, I told the gentleman that the door had _______ automatic opener, and he did not need to stay to hold it open. He said “Here I thought I would have an opportunity to be
_________ (help).”
At that, I backed up, let the door close, and allowed him to reopen the door, not _________ (use) the automatic control this time. His comment then was “Well, now I feel like that I
_________ (accomplish) something helpful and worthwhile today.”
We never know _________ someone else is feeling. We seniors seem to feel we can take care of
________ at all times. That random act of kindness brightened not only my day, but
________ my joy and delight, also the day of that white-haired senior citizen. I felt a glow for the rest of the day, and, hopefully, so did he!
So, gentle readers, never hesitate ________ (offer) kindness. You may find to your
________ (amaze) that there is more kindness in your community than you ever believe possible.
The truth that trees are vital to our life is not a secret. They provide us with food, wood and most (important), oxygen. Now there is one more thing we can add to this list—blocking out harmful bacteria from water.
The discovery (make) by a team
(consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students who were seeking a natural water filter—one that would help communities in developing countries that do not have
(accessible) to modern water filter systems.
The (research), led by Professor Rohit Karnik, decided to turn to trees for help because they could allow liquid to flow through, while blocking out air bubbles.
They began by cutting 1.5-inch-wide sections of tree bark from the branches of a white pine tree. The people related then tested the wood’s filtering ability by pouring water containing red dye particles of different sizes through. To their amazement, they found that it was effective in trapping all the articles. (encourage), the team conducted another experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.
Many people travel during the holiday season but do not make sure that their houses and homes (protect). Crime goes up
(rapid) during the winter and summer holiday seasons. Here are some things that you should keep in mind when you go on a holiday.
Always give (strange) the feeling that you are at home. Have the snow
(clean) off your stairs or out of your driveway during the winter season. You might ask someone to park his cars in your driveway.
Tell your newspaper deliverer that you are not at home. (have) a pile of newspapers and other mail on your doorsteps tells people that you are not at home, so you could also have a neighbor or a relative get your mail every day.
Do you like travelling? Staying （health） while
（travel） can help to ensure your trip is a happy and enjoyable one．If you are travelling abroad, here are the tips you need to make your trip much
（easy）:
Make sure you have got signed passport（护照） and visas．Also, before you go, fill in the emergency information page of your passport! Make two copies of your passport identification age．This will help a lot if your passport __（steal）．Leave one copy at home with friends or relatives．Carry the other with you in a separate place from your passport．
Read the Public Announcements or Travel Warnings for the countries you plan to visit．Get yourself familiar with local laws and customs of the countries to which you are travelling．
Leave a copy of your itinerary（旅行日程） with familyor friends at home so that you can be contacted in case of an emergency．
Do not accept packages from strangers．Do not carry too much money or （necessary） credit cards．If we make enough
（prepare）, we will succeed．Have a good time!
If it (turn) cold again, they'll dive back down. But they come out again if it is warm last, how much will an ant gather during the summer to prepare for the winter? All that it
(possible) can.
Set up your goals positively．
How you describe your goal makes a big difference．Focusing on whatyou want to“bring into your life —not what you want to avoid—wi11 make you more likely to (actual)pursue it.
Prepare for failure(in a good way)．
Moments of failure (be)unavoidable，but most of us abandon the goal entirely when slight failures and setbacks start piling up．At the moment when you fail，often the first instinct(本能)is to push the goal away. It's so
(comfort)to be in that condition of self-doubt or self-criticism and guilt．