Watch out! Do not get too close to the building. The walls .

A. are being painted

B.are painted

C. have painteci

D. have been painting

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It is known to us that puter users are being warned by industry experts to pay attention to secret codes which could be used to record their conversation.

E-mails, screen savers, and electronic greeting cards can carry a secret code which is able to turn on the puter’s microphone, make a recording, and forward it to someone else without the user’s knowledge.

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