1. The invitation says that everyone should wear a disguise(伪装).
2. When accidents(事故) occur, we should calm down and turn to teachers or parents for help.
3. Chinese subway trains are now exported(出口) to developed countries including the United States.
4. A sense of humor can also help to ease the tension(紧张)between people.
5. I’ve learned English for more than eight years and I am familiar with computer operation(操作).
