Mary is good at _________.A. sing B. sings C. singing
A: Here's a carton of milk for you. B:________.
A : I'm ________. B : Here's a hot dog for you.
当你累了,别人给你一张凳子坐的时候,你应该说:
别人问候你,你会回答:
当你觉得累了,你会和妈妈说: