đáp án: c
lời giải:
diplomatic = tactful (a): khôn khéo
eg: they need a tactful word of advice
strict (a) nghiêm khắc
eg: civil servants are bound by strict rules on secrecy
outspoken (a): ngay thẳng
eg: he has been outspoken in his criticism
firm(a):vững chắc
eg: the bed should be reasonably firm, but not too hard