[R-3] Please choose a proper word or phrase from the list below and put it in one of the blank spaces in the following sentences. Fill in the blank with the letter for the answer. One word or phrase is not to be chosen.
A.
national
B.
fake
C.
vulnerable
D.
infectious
E.
secure
F.
illegal Or the goods for sale may be counterfeit. One American company that investigates businesses on the Internet estimates that about 20 percent of all brand-name goods on the Internet are (1) ________ products. Computer viruses and worms are (2) ________ computer programs that cause damage. Experts suspect that some hacking is organized by (3) ________ governments. In order to protect the privacy of personal information, it is important to send it only by (4) ________ methods. They do not want the public to think that they are (5) ________ to such crimes because the public may lose confidence in the company.