---The sick kids look unhappy. What shall we do?
--- Let's do something to .
A. cheer them up
B. cheer him up
C. take care of him
D. look them after
网友回答
(答案→)A. cheer them up
B. cheer him up
C. take care of him
D. look them after
解析：根据上文的内容-The sick kids look unhappy，可知下文的人称代词为them，又根据上文的内容，可知为鼓励他们的意思，故选答案为A