1 . There are purple clothes, purple handbags, purple bicycles, purple furniture, even purple computers! So purple is one of the most ______ colors today. But in the past, purple was a very expensive and unusual color. Let’s take a look at the rich ______ of the color purple.

Some scientists believe that the first plants to appear on Earth over 500 million years ago _____ looked purple, not green. Plants today are green because ______ use green chlorophyll (叶绿素) to produce energy. ______ these early plants probably used something called retinal, which is a dark purple color.

During the time of the Roman Empire (37 BC-476 AD), it was very ______ to make purple dye (染料). The dye came from sea snails (海螺). But 10,000 dead sea snails ______ you just one gram of purple dye... as well as a very bad smell! This ______ purple dye was called Tyrian purple, and it was the preferred ______ of emperors.

In 16th century England, purple was ______ for the kings family members. Queen Elizabeth I’s clothes were purple, but ordinary people were not allowed to ______ the color.

In 1856, William Perkin, an 18-year-old ______ student, noticed something strange while doing an experiment. The chemicals he used to clean his instruments ______ with the chemicals he used in his experiment and produced a bright purple color. This ______ led Perkin to start a company using this chemical mixture to make purple dye. The dye was much ______ than sea snail dye. Thanks to Perkin, now anyone can afford to wear purple clothes.

3 . I had to work as a substitute teacher (代课老师) before finding a full-time teaching job. One day, I _________my first substitute job at a school. The _______ said that I had to arrive at school at 8:00 am when I would sign in.

As it was my _______ day at this school, I made sure of leaving plenty of _______ to get to school. I got up early so I _______ at the school at about 7:50 am. I sat in my car for ten minutes playing with my phone to _______ time. Then I walked into the teaching building and up to the reception (接待) desk at 8:00. When I told the receptionist my _______ , she shouted at me for being _______ and said that the headmaster was managing the class until I _______.

I said the email I received ________ told me to arrive at school at 8:00, but the receptionist said what I said was a(n) ________. I finally gave up trying to ________ with her, went up to the classroom, and took over the class from the ________.

During the ________, I was sitting in the office when the headmaster ________ and asked why I was late. I ________ that the email had given the wrong information. He said that even though that was what the email said, I ________ should have gotten to school before 8:00 am because that’s what ________ people do, in case something unexpected might happen.

The headmaster’s ________ had a strong influence on me, and then I ________ to become a smart person. Since then I have never been late for school.

4 . One day, two little boys were walking along the road. They overtook a woman_______a large basket of apples.

The boys thought the woman looked very_______and tired, so they said, “Are you going to town? If you are, we will carry your_______.”

“Thank you,”_______the woman, “You are very kind. You see I am weak and ill.” Then she told them that she was a _______, and had a lame son to_______.

She lived in a cottage three miles away, and was now going to the_______to sell the apples which grew on the only tree in her garden. She wanted the money to_______her rent.

“We are going the same way you are,” said the boys. “Let us have the basket.” And they took_______of it, one on each side, and trudged (艰难地走) along with________hearts.

The poor widow looked glad, and said that she hoped their mother would not be________with them. “Oh, no,” they replied, “Our mother has taught us to be kind to everybody, and to be useful in any way________we can.”

She then offered to give them a few of the ripest apples for their________. “No, thank you,” said they, “We do not want any pay for what we have done.”

________arriving at home, she told her lame son what had happened on the road, and they were both made happier that day by the________of the two boys.

The other day, I saw a little girl stop and________a piece of orange peel, which she threw into the gutter. “I wish the boys would not throw orange peel on the sidewalk,” said she. “Someone may tread upon it, and________.”

Perhaps some may say that these are little things. ________they are. But we must not wait for________to do great things. We must________with little labors of love.

5 . We are warned by our teachers not to waste time because time _______ will never return. I think it quite _______. What does time look _______? Nobody knows, and we can’t see it or touch it and no _______ of money can buy it. Time is abstract, so we have to _______ about it.

Time passes very quickly. Some students say they don’t have _______ time to review their lessons. It is _______ they don’t know how to make use of their time. They waste it in going to theatres or playing, and _______ other useless things. Why do we study every day? Why do we work? Why do most people _______ take buses instead of walking? The answer is very ________. We wish to save time because time is ________.

Today we are living in the 21^st century. We ________ time as life. When a person dies, his life ends. Since life is short, we must ________ our time and energy to our study so that we ________ be able to work and live well in the future. Laziness is the ________ of time, for it not only bring us ________, but also does other ________ to us. If it is necessary for us to do our work today, ________ we do it today and not ________ it until tomorrow. Remember that time is much more ________.