They ______ Singapore for about a week．

A．have been to         B．have gone to         C．have come to        D．have been in

完形填空

　　Stamp collecting is perhaps the most popular hobby in the world. 1 people have been collecting stamps from different countries, for different reasons and in different ways.

　　I collect stamps from Singapore, Malaysia, Canada and the U. K. only. I 2 collect stamps from every country because there are too many. Some countries have hundreds of new stamps every 3 .

　　My father and sister work in offices, 4 sometimes they bring foreign stamps home. If I don't want a stamp, I try to swap it with a friend. I don't 5 any stamps because they cost too much money.

　　Most of my stamps are 6 ones, which are stuck on paper at first. I have to get the stamps off the paper 7 damaging(毁坏) them. 8 wants to collect damaged stamps. I put the stamps into water in a bowl. After ten to twenty minutes, the water makes the paper 9 . Then it is 10 to peel off the stamps carefully and let them dry. After that, I put them in one of my stamp albums(集邮册). I have 11 albums, one for each country.

　　I can 12 many things from my stamps. They make my school subjects 13 . They show me what birds, animals and plants there are in a country. They let me 14 about the people and events in different countries. Some old stamps are very valuable. Perhaps one day some of my stamps will be 15 , too.

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If you want to get a new cell phone number, don’t forget to bring your ID(身份证明) with you .
As of September 1, people have to register(注册) with their ID to buy a new cell phone number. You can show your ID card or hukou, but student ID’s won’t work.
If you already have a cell phone number, it is better to register it before 2013.
The new rules are meant to prevent junk messages and fraud(诈骗) through cell phones.
A cell phone user in China on average received 43.3 messages a week in the first half of this year. According to reports, about 12 of those were junk messages.
In a survey, about 74.5 percent of users said they have received fraudulent(诈骗的) messages.
If all people register their cell phone number with ID information, it will be easier for police to find the people behind those messages.
Situations in other countries
Because cell phone are getting more and more popular, many countries have made stricter cell phone rules.
Countries like India, Japan, Australia, and Singapore all ask users to register their ID information.
Ulrich Mller is a German living in Beijing. “In Germany, you have to show your ID when you buy a cell phone card,” he said. “The rules have been there for a long time. Most people know about it.”
Linda van der Horst is a student at Peking University. She said that in the Netherlands(荷兰)，people have to show ID information and bank account(账户) information to buy a cell phone card.
【小题1】What is the passage mainly about?