二、选词填空。
根据语篇内容，从方框中选择恰当的单词，并用其正确形式填空。每个单词只能用一次。
build careful unhappy help personal impolite rules safe treat understand
In the 5G era, we often communicate with people online. So it is necessary for us to learn about 1 of talking in the virtual（虚拟的）world. Here are some important tips.
First, remember to 2 others online with respect, just like you do in real life. Don't use 3 words. This is the first step in 4 good relationships with people online.
Second, try to use short and clear sentences. If you use too many words, it is difficult for others to 5 you. So keep your messages easy to read.
Third, be 6 with what you post online. Don't share the pictures of your classmates, teachers, or family members with the online strangers. This can be 7. The same rule is also true for your 8 information like your names and phone numbers. It's better to be safe than sorry.
Lastly, only post 9 and true information. Before you post something online, ask yourself: "Is this true? Is this useful?" Once you post something bad online, it's hard to take it back. Think carefully before you post, or you might make yourself or others 10.
If you follow these rules, you'll do great when talking online.
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1. rules 2. treat 3. impolite 4. building 5. understand 6. careful 7. unsafe 8. personal 9. helpful 10. unhappy