问题补充：
Could you please give me on how to improve my English?
A. a piece of advice
B. some piece of advice
C. some advice
D. an advice
答案：
(答案→)A. a piece of advice
B. some piece of advice
C. some advice
D. an advice
解析：advice 为不可数名词，一则消息，为a piece of advice，一些消息为some pieces of advice，故选答案为A
