句型转换（本题5小题；每小题1分，满分5分）

小题1:Jane bought the computer last Sunday.（保持你句意基本不变）

Jane _______ _______ the computer since last Sunday.

小题2:She asked me, “Do you know how to stop the machine?” (改为间接引语)

She asked me _______ I _______ how to stop the machine.

小题3:My sister is very generous. She often shares her things with her friends.(合并为一句)

My sister is _______ _______ toshare her things with her friends.

小题4:Both of my parents enjoy reading newspapers. (改为否定句)

_______ of my parents ________ reading newspapers.

小题5:The girl spread the coins all over the floor.(改为被动语态)

The coins _______ _______ all over the floor by the girl.

如果一个登录处理系统允许一个特定的用户识别码，通过该识别码可以绕过通常的口令检查，这种安全威胁称为______。