请将下列单词中不同类的一项选出来。
1.A. on foot              B. by ferry       C.by sled          D.by plane
2.A.snow                 B.cloud          C.quiet            D.wind
3.A.usually              B.sometimes      C.often            D.then
4.A.stop                  B.light          C.wait            D.go
5.A.traffic lights        B.red light       C.yellow light     D.green light
6. A. east               B. west          C.eat             D. north
7. A. museum              B. bookstore     C. music          D. library
8. A. london             B. China         C. Germany        D. England
9. A. turn right          B. go home        C. turn left       D. go straight
10.A.green light          B. yellow light   C. red light       D. Christmas light