Read and choose. (选出不同类的一个，将序号填在括号里。) 
(    ) （1）A. older         B. smaller        C. fever
(    ) （2）A. bed           B. excited       C. sad
(    ) （3）A. yesterday     B. tomorrow      C. trip
(    ) （4）A. actor         B. mother         C. nurse
(    ) （5）A. climbed        B. sing          C. danced
(    ) （6）A. red           B. green         C. chair
(    ) （7）A. bought        B. saw           C. boat