During the past twenty years, there have been _____ changes in the country;

A. with B. to C. against D. for

A) the best B) the better C) best D) better

A) who B) whom C) whoever D) whomever

A) as B) which C) it D) that

A) count on B) call on C) live on D) wait on

A) is B) have been C) are D) bas been

A) revealed B) released C) resolved D) relieved

A) understand B) understanding C) understood D) to understand

A) managed B) attained C) succeeded D) achieved

A) writing B) write C) to write D) to have written