Students often want to practise their English outside class. One of the best ways of practicing your English is to speak to foreigners. Most of the students ask，"Is it OK to talk to foreigners when we meet them in the street?" The answer is yes or no，but probably no! If you see a foreigner who looks lost，it is polite to ask him or her，May I help you?" But if not，you should probably let him or her go on with the business. That is，you can talk to a foreigner at some time or places. It is quite OK to ask him or her questions if a foreigner comes into your school, classroom or your teachers' office. It's also OK to talk to foreigners in some public places. If you see a foreigner and there is no other one with him or her in a restaurant，a waiting room，or a shop，it is the right time for you to ask him or her，"Is this seat free?" or questions like this. You can probably help them if they are new to China, And if they are alone，you may be able to make them feel more welcome. It's a pleasure to talk to a foreigner if you choose the right time and place.

The best title for this passage is __________.

A.how to learn English in class

B.how to talk to foreigners

C.why to learn English

D.when to speak English outside class