Read the passage and mark A, B, C, or D to indicate the correct word or phrase that best fits.

When you game online, be careful when you make friends with strangers. What should you do? Firstly, remember that it is (11)……………to lie online and some of these “online friends” may be adults (12)……………..want to harm you. Secondly, never give your personal information such as your full name or your hometown. Thirdly, only play online games when you have (13)………..antivirus software. In addition, tell your parents what games you are playing and what you love (14)………….them. In short, just like in the real world, you need to be careful when (15)……………with strangers.