Signs carry messages. For example, a sign at the bus stop helps you to know 小题1: (哪一个) bus to take. A sign on the wall of your school helps you find the 小题2: (图书馆). Signs through doors tell you where to go in or out. 小题3: (假如) you see the sign “No photography”, you can’t take 小题4: (照片). When you find the sign “ Danger”, you must be 小题5: (小心的). If you want to cross the road, you should 小题6: (等候) for the green light at the crossing. When you visit a museum and see a sign “Keep quiet”, you aren’t 小题7: (允许) to speak loudly. Have you 小题8: (曾经) noticed that there are a lot of signs around you and then you receive messages from 小题9: (它们) all the time. It’s necessary to 小题10: (记住) some of the signs.