根据首字母及汉语提示，完成下列单词的拼写，使句意通顺。

1.Do you think this kind of water is s_____(安全) for drinking?

2.He is writing on the blackboard with a piece of c_____ (粉笔).

3.Our teachers are all very s_____ (严格) with us students.

4.Tom i_____ (邀请) all his best friends to his birthday party last Sunday.

5.We have to d_____ (携带) a lot of books in our school bags every day.

假定你叫张华，最近从报纸上得知美国某公司将在你的家乡建一座工厂，请给该公司写封电子邮件。要点如下：

    ●表示欢迎：有利于家乡发展等；

    ●感到担忧：造成环境污染等；

    ●希望了解有关环保措施及更多信息。

  注意：1．词数80—100；

        2．请不要逐句翻译，可适当发挥以使行文连贯；

        3．邮件的开头和结尾已为你写好，不计入总词数。

Liu Ming is _______18-year-old student. He got a gold medal in the competition.

   A. a                                                  B. an                                         C. the

 —Excuse me. How far is the post office from here?

   —It’s about _______walk.

   A. ten minute                                      B. ten minutes                                          C. ten minutes’

John and I will go out for a walk after we _______our homework.

   A. finish                                   B. finished                                      C. will finish

 As we know, the Changjiang River is one of _______rivers in the world.

   A. long                                    B. longer                                        C. the longest

My hobby is changing all the time. Now I am _______ in collecting coins. It’s_______ and valuable.

   A. interesting; interested                            B. interested; interesting                C. interested; interest

Excuse me, sir. Could you tell me _______?

A. where can I get a post card

B. where I can get a post card

C. that I could get a post card

 —How long _______it _______ you to work out such a difficult problem?

   —About thirty minutes.

   A. did… take                                       B. does… take                                   C. did…cost

 We used to study in the old building_______ was broken down last year.

   A. which                                            B. where                                       C. what