(    ) 1. Two of them are here, but where are _____ students?

      A. the other    B. others    C. others    D. another

(    ) 2.____ is easy for a child to know where they are.

A. It                      B. That                      C. This                           D. What

(    ) 3.When I got there ,I saw some boys _____ on the playground.

A. playing           B. played          C. to play          D. was waiting

(    ) 4.What_____ you____ when your mother came back?

A. are; doing B. were ; doing C. did; do