The stock ______ in value should be sold.

单项选择题______, I wrote a letter to Henry Ford Ⅱ and told him what happened.

单项选择题He was a person who would stand up for what he thought right, ______.

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.