222.[答案]C. resign[详解]resign(=give up a post)辞职：1)imagine he will resign.2)It was his duty to resign his position.discharge sb.= dismiss sb.解雇某人：He was discharged(=dismissed) for being dishonest.

221.[答案]C. research[详解]research into对...研究：1)(作动词用)He is researching into the reading problems of young school children.2)(作名词用)to carry out a research(=some research)into the causes of brain damage.(对大脑损伤原因进行研究)。

　研究可译为make researches into, make a study of 或直接用动词study vt或research into (a problem etc.).

220.[答案]C. bound[详解]be bound to sth.受...的约束：I was bound to my promise.(我受我的诺言约束)[注意]be bound to do sth.1)一定会：The plan is bound to win.(这项计划一定会成功。)2)有责任(义务)：You are bound to obey the laws.(你有责任遵守法纪)。

　本题译文：我支持你的决定，但是我得说明，我不打算受它约束。

219.[答案]D. picked up[详解]pick up学到，习得。详见Ⅲ。130注释。

218.[答案]B. soundly[详解]sleep soundly熟睡。也可以说sleep heavily.

217.[答案]B. it worthwhile[详解]worthwhile值花时间(或精力)干的：1)The visit to Paris was worthwhile .2)He thinks teaching foreign languages is worthwhile.3)She has a very worthwhile job.4)I think it worthwhile to work on my stamp collection.

　Worthy (of)配得上，值得：1)He is worthy of being praised.(=He is worthy to be praised.)2)He is a worthy winner.3)She is not worthy to talk to man like you.(她配不上与你这样一位男士谈话)。

216.[答案]C. possible[详解]able有才能的，有能力的，指人的才智，而且是受过实际锻炼的才干。Capable“有才能的，能胜任的”(有褒、贬 二义)，如：He is capable of anything.(他什么事都干得出来。)此句含有明显得贬义。此外，作表语时，able接不定式，capable接of. capable还有一意思是“有可能 的”，例如：The car is capable of being repaired .(这辆汽车是有可能修好的。)用于此义时，be capable of 后常接被动语态动名词或有动作意义的名词：The situation is capable of improvement .possible 强调客观可能性，“可能的”程度比probable"大概的，很可能的低一些。

　[注意]likely与possible在结构搭配上的区别。Likely可用于下列句型中：1)It is likely that...例如：It is highly likely that he will succeed.(很可能他会成功。)2)think(feel, consider)it likely ...例如：I think it likely that we will ultimately get a certain amount of money.3)be likely to do sth.例如：He is likely to see you again .但下面的句型是错误的，It is likely for sb to do sth.所以think it likely for sb. to do sth.也是错误的，故本题不能选likely.

215.[答案]D. worry[详解]worry既可作动词用，也可以作名词用，意思是“忧虑”，后接介词about或over。worry over 比worry about对某事的忧虑更为持久，更为专注，如：He worries over the least thing that goes wrong.(他总是惟恐有一点小事出错。)

214.[答案]D. wear out.[详解]wear out本题中意指(become useless form continued use of wear)用坏，穿破，如：The machine will soon wear out.(这机器即将用坏。)come to and end(结束)，put ... to use(投入使用), use up(用完)， come into use(开始投入使用)。

213.[答案]A. warned.[详解]warn sb. (not) to do sth.警告某人(不)做某事。

　Suggest不能接sb. to do sth。persuade sb.(not) to do sth.说服、某人(不)做某事;本题中不能选D. persuaded, 因该动词强调行为的结果。从逻辑上讲，既然“说服了”，那么与she wouldn't listen to me就前后矛盾了。如果把句子该为：I tried to persuade her not to walk on the thin ice but she wouldn't listen to me.(我极力劝她不要在薄冰上走，但她不愿听我的话。)，那么就符合逻辑了。[注意]warn sb. of sth.警告某人有......。