3.C. achieve的基本词义为实现， 获得， 因此C是答案。
需要掌握的相关近义词词组：
achieve attain gain obtain 获得
reach arrive at get to 到达
4.They have made up their mind to give up smoking.
A) tried B) attempted
C) agreed D) decided
4.D. make up ones mind是固定搭配结构， 其含义为决心， 决定， 因此D是答案。
需要掌握的相关近义词词组：
make up ones mind decide be determined 决心
agree consent 同意
try attempt 试图
短语give up出现频率也较高，职称英语词汇选项练习部分出现了关于give up的练习题：
5. They have given up the hope to save their friends from drowning.
A) ended B) abandoned
C) built D) strengthened
5. B. give up是放弃， 因此B是答案。
save ...from...拯救...使免予遭受到...
类似结构：
prevent ...from...防止... 使免予遭受到...
protect...from...保护...使免予遭受到...