请从所给的十组对话中选择恰当的一组,并将其字母代号填在每小题相应情景图画下面的括号内。
He can ____ Chinese. A. say B. tell C. speak
I ___ a robot.A. has B. have C. having
____ are hard-working. A. They B. Is C. Am
____ they helpful at home? A. Am B. Is C. Are
Chen Jie ____ polite. A. am B. is C. are