17．Mrs．Smith lost her son when she was    ．
A．doing some shopping      
B．calling the office      
C．taking a walk．
18．The boy is thin and has a round face with    hair．
A．brown
B．black
C．yellow．
19．There is a picture of Micken Mouse on the boy's    ．
A．T-shirt
B．pants
C．coat．
20．If you see the boy，you can call Mrs．Smith at    ．
A.109-6321
B.321-6091
C.632-1091．

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