根据短文内容，用方框中所给单词的适当形式填空，每词限用一次。

The panda is one of the most popular 　1.　 in the world. A panda can grow up to 1.5 meters long and weigh up to 160kg. People think the panda is very　2.　. So it is not surprising that the WWF（世界自然基金会）chose the panda as its symbol. The WWF tells people about animals that are in 　3.　and raises money to save them. The panda only 　4.　 in the wild in China. In the early 1980s, there were only 1,000 left in the wild. The main reason 　5.　 pandas are endangered(濒临灭绝的) is that the area where pandas can live has become smaller.

Do you know how to write an English letter and envelope?
When we write a letter in Chinese, we always put the date at the end of the letter. But it is different in English. We have to put it on the top of the right corner. And above the date, we also write the number of our house and the names of our street, city and country. To begin the letter, we always use the word like "Dear sir",　 "Dear Mr./Miss./Ms.…". To end the letter, we usually use words like "Yours”, “Yours ever" or "Truly yours".
Now read the following envelope, please.
【小题1】"We have to put it on the top of the right corner." The word "it" here means_____.
A. the date　　　　　　B. the letter　　　　 C. the passage
【小题2】To what country will the letter be sent?
A. P.R. China　　　　　B. China　　　　　 C. The United States
【小题3】Who writes this letter?
A. Miss Susan Brown　　B. Zhang  Hua　　　C. You
【小题4】From the passage, we know when we write an English letter, we should
put down our address _____.
A. at the end of the letter on the right
B. at the end of the letter on the left
C. at the top of the letter on the left
【小题5】How do you begin your letter if you write to John Smith?
A. John Smith　　　 B. Mr. John　　 　C. Dear Mr. Smith

　The word“day” has two meanings. When we talk about the number of days in a year,  we are using “day” to mean 24 hours. But when we talk about day and night,  we are using“day” to mean the time between sunrise and sunset. Since the earth looks like a ball,  the sun can shine on only half of it at a time. Always one half of the earth is having day and the other half night. A place is moved from day into night and from night into day over and over by the spinning（旋转）of the earth. At the equator（赤道）day and night are sometimes the same length（长度）. They are each twelve hours long. The sun rises at 6 o’clock in the morning and sets at 6 o’clock in the evening. For six months the North Pole is tilted（倾斜）toward the sun. In those months the Northern Hemisphere（半球）gets more hours of sunlight than the Southern Hemisphere. Days are longer than nights. South of the equator nights are longer than days. For the other six months the North Pole is tilted away from the sun. Then the Southern Hemisphere gets more sunlight. Days are longer than nights. North of the equator nights are longer than days. Winter is the season of long nights. Summer is the season of long days.

1.When the Western Hemisphere is having day,  the Eastern Hemisphere is having ________.

　　A. both day and night　　　　　　　B. day

　　C. neither day nor night　　　　　　D. night

2.A place is moved from day into night and from night into day over and over by ________ of the earth.

　　A. the pushing　　B. the pulling　　 C. the spinning　　D. the passing

3.．At the equator day is as long as night ________.

　　A. sometimes　　 B. never　　　　 C. usually　　　　D. always

4.When the North Pole is tilted toward the sun,  the Northern Hemisphere gets ________ sunlight.

　　A. less　　　　　B. more　　　　 C. all　　　　　　D. no

5.．When it is winter in China,  ________.

　　A. the USA is tilted toward the sun

　　B. the South Pole is tilted away from the sun

　　C. the North Pole is tilted toward the sun

　　D. the North Pole is tilted away from the sun