[填空题]所谓____________信号就是将数字信号1或0直接用两种不同的电压来表示，然后送到线路上传输。

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• ●    (单选题)The computer turn it __________ green, yellow, or red light.(2)
• ●    Laura didn’t go to the police or court becaue_________.
• ●    All tudent are eager to know ______________they wilt pa the exam or not
• ●    Our ucce _______ whether everyone work hard or not.( )
• ●    Morning or afternoon. It make no _______ to me.
• ●    Whether we will go or not __________ the weather.
• ●    Which ________ do you prefer, coffee or orange juice?
• ●    All tudent are eager to know ______________they wilt pa the exam or not
• ●    The alutation i written fluh with th________margin________pace or line below the inide addre.
• ●    The alutation i written fluh with th________margin________pace or line below the inide addre.
• ●    If you need more information, pleae contact u __________ telephone or email.
• ●    Table______ of tone or wood.