52.People in China and Europe have different ideas (　　　 ) etiquette.

51.We should also take care not to sneeze loudly (　　　 )public.

50.Standing close (　　 )the person you are talking with is quite common in China.

49. This seems (　　　　 )a difficult word at first.

48.(　　　 )the future,I should try not to be so polite.

47.This happens (　　　 )me all the time in the school library.

46.I don’t like it when shop assistants follow me (　　　　 ).

45.Last night, I had a long telephone conversation (　　　 )my parents.

44.I don’t know the way (　　　 )the sports club.

43.My mother ordered a hamburger (　　　 ) French fries.