1. Playing online during the workday. If you’re logged into Gmail chat all day, doing your holiday shopping online, or playing on Facebook when you should be working, it could cost you your job. Your employer has the right to monitor anything you do on your work computer, including checking your personal email. Never use your work computer for anything you don’t want your boss to know about—whether it’s job-searching, online shopping, complaining about your job, hanging out on social networking sites, or anything else.
1. 工作时间上网。工作时间登录Gmail聊天，网购假日促销品，或在Facebook上交友，这样，你的饭碗可能就危险了。监控你的工作电脑是老板的权利，查看你的个人邮 件也不为过。如果不想让老板知道，你在网上搜索新职位，在线购物，发牢骚，逛社交网站等等，就别在工作电脑上做这些。
2. Complaining about your boss. You never know who might be listening, and if you get a reputation as a complainer, your boss will eventually hear about it.
3. Not owning up to mistakes. Everyone makes mistakes from time to time; what matters is how you handle it when you do. If you don’t accept responsibility or—worse— try to cover up that a mistake was made at all, your boss will likely be far more angry at this than at the mistake itself.
4. Being preoccupied with whether something is your job or not. Protesting that something isn’t in your job description is a good way to lose the support of your boss. Job descriptions aren’t comprehensive, and most people end up doing work that doesn’t fall squarely within that job description. (That’s what “and other duties as assigned” means.) People who balk at this often end up at the top of a lay-off list. You want to make yourself more valuable to your employer, not less.
5. Getting angry at work. It’s normal to occasionally get frustrated at work, but it crosses a line if you’re yelling, slamming doors, or snapping at people. It only takes one incident like this to get a reputation as the angry guy who no one wants to work with, and that’s a label that’s very hard to shake.