A．whatever the cost to himselfB．what the cost to himsel……

单项选择题You can't be ______ careful in making the decision as it was such a critical case.

单项选择题Problems common to most countries include the social, economic ______ problems.

单项选择题These excursions will give you an even deeper ______ into our language and culture.

单项选择题He is ______ of a musician.

单项选择题He came all the way to China for promoting friendship ______ for making money.