Write the right word form requested in the parentheses．

(根据括号内的要求，写出单词的正确形式。)

1．ruin ________(动词)

2．shake ________　________(动词的过去式及过去分词)

3．rise ________　________(动词的过去式及过去分词)

4．burst ________　________(动词的过去式及过去分词)

Choose the right description of the underlined part in each sentence．

(选出对句中画线部分描述正确的选项。)

With the progress of new medical research, I’m confident that people like me would be able to walk again one day．

A．表示时间

B．表示原因

C．表示伴随

仔细阅读下面的短文，短文中有10个空格或画线句子。请按照每小题括号内的具体要求完成语法填空、词形变化、句子合并、句子改写以及病句改正等。

　　Electronic mail(e-mail)　　1　　(start)in the late 1960s by the U．S．military．By the 1980s, academics in a number of fields were using e-mail for professional collaboration．The early 1990s 　　2　　(see)an explosion of the use of e-mail and other computer networking tools for a wide range of professional, academic, and personal purposes．

　　E-mail is a way of 　　3　　(send)a message from one computer to one or more other computers around the world．First, you 　　4　　(短语动词)the e-mail address of the person you are sending the message to．Then you write the message, or 　　5　　(direct)in a special e-mail software program or first in a word processing program and transfer it into the e-mail software．You should push a button 　　6　　 a simple command to send the message．The computer system you are connected to will break the message up into tiny pieces and send them 　　7　　(electronic)to the destination．The pieces might travel numerous routes through other computers on the way．Usually within 2-3-minutes, the pieces will all arrive at their destination, where the 　　8　　(receive)computer will reassemble them into a message．The person 　　9　　 the message can check his or her mailbox at a 　　10　　(convenience)time and read the mail．