小博士：仔细观察下面的基数词和对应的序数词的区别和变化，你会发现这种变化是有规律的，你能归纳出来吗？请根据规律填出所缺的基数词和序数词，并特别注意黑体字的词。

我找到规律了！请看：

1　　英语序数词1～19，除first，second，third等特殊形式外，其余的一般是在相应的基数词后加-th构成。

2　　有几个序数词加-th时拼法不规则，要注意。如fifth，________ ________ ________。

3　　十位整数的序数词的构成方法是先将其基数词的词尾“ty”中的“y”改为“i”，再加“-eth”。如________。

4　　基数词“几十几”变成序数词时，只需将个位数变成序数词，十位数不变。如________。

Wen Feng Store Sale

Goods     Colors     Price（each）

Socks      Black, white, green $3

Sweater   Black      $15

Hat  Blue, white     $4

T-shirt     Red, green      $14

Shoes      Black and white     $25

Bag  Blue $5

根据表格内的信息，选择最佳答案。

1.In all goods（商品）, ______is（are）cheap（便宜）.

A．Bag              B．Shoes            C．Hat              D．Socks

2.Jack wants to buy two pairs of socks, one bag and two hats. How much are they?

A．Twenty-one yuan.                       B．Nineteen yuan.

C．Eighteen dollars.                        D．Nineteen dollars.

3.Mary only likes blue, so she will（将要）buy______.

A．socks and bag                          B．pants and sweater

C．hat and bag                            D．shoes and hat

4.The store has hats in______.

A．all colors                              B．blue, white and black

C．blue and black                          D．white and blue

5.Peter has twenty dollars, so what can he buy?

A．Two bags and one T-shirt.

B．Three hats and two bags.

C．One sweater and two pairs of socks.

D．One T-shirt and one bag.

"We will learn        English words this year," the teacher said to the students.

We are students of Fuxing Middle School. In our school, there are many teachers and students. There are some trees, too. There are forty-five students in our class, twenty–four girls and twenty-one boys. Our classroom is big. There are six windows and two doors. There are four pictures on the wall. On the front(前面的) wall there is a big blackboard. Our desks and chairs are new. Our classroom is very nice.

1.90． --What’s the school’s name?

It’s                            .

2.--How many students are there in the class?-- There are          . 

3.–Is the classroom big or small? –It’s            .

4.–What’s on the wall? –There are four           on the wall.

5.On the front(前面的) wall there is a big           .

In the United States, sixteen, eighteen, and twenty-one are important ages in a person’s life. There are no special celebrations for these birthdays, but each is a time when a person can do new things to mark their transition(转变) into adulthood.
After turning sixteen a person can work, get a driver’s license and leave home. Many high school students learn to drive and get part-time jobs soon after celebrating their sixteenth birthday.
At the age of eighteen a person in the United States can vote and smoke, but they are prohibited from going into nightclubs, buying wine or gambling(赌博) until they are twenty-one.
In many Latin(拉丁的) cultures, a young woman’s fifteenth birthday is important. At this age, she is regarded as an adult. To mark this special day, families with teenage daughters have a celebration called a Quinceanera. The day begins with the young woman and her family going to church. Later, there is a party and many guests are invited.
In Japan, young people became adults at twenty. At this age, they can legally(合法地) vote, drink wine and smoke. The second Monday in January is a national holiday called “Coming of Age Day”. On this day, twenty-year-old celebrates by first going to church to pray with their families. Later, they listen to speeches given by city and school leaders. Afterward, they may celebrate with family or friends late into the night.
In some countries, birthday celebrations continue through adulthood. Some people celebrate their fortieth and fiftieth birthdays, or their retirement(退休) year, with a huge party.
【小题1】 In the United States, age sixteen marks the time when you can ___________.