小题1:was difficult to find
小题2:being recognized
小题3:did he account for
小题4:feeling frustrated/ depressed
小题5:What puzzles me/ What makes me puzzled
小题6:has taken measures
小题7:five times the size
小题8:what it was
小题9:should have started earlier
小题10:where you can enjoy

试题分析：
小题1:was difficult to find ：固定句型：主语 + be + 形容词 + to + 动词。如：The problem is hard to deal with那问题难以处理。
小题2:being recognized 非谓语动词：由于主语是recognize的动作承受者，without为介词，后应用v-ing形式作宾语，故填动名词的被动式。
小题3:did he account for固定句型：Not until短语放在句首时，主句采用部分倒装结构。如：Not until half an hour later did the doctors and nurses arrive at the scene直到半个小时后医护人员才到达现场。
小题4:feeling frustrated/ depressed非谓语动词：句子的主语是feel的动作执行者，故用现在分词。
小题5:What puzzles me/ What makes me puzzled 主语从句：What引导的主语从句，相当于“某人所做的事，所说的话”或“令某人吃惊、迷惑不解”等。What surprised me most is that four Chinese lost lives in this drowning ship.令我吃惊的事是这次沉船事故中有4位中国人丧生。
小题6:has taken measures 现在完成时态：表示过去动作对现在造成的影响，用现在完成时。
小题7:five times the size 倍数表达法：英语中一般将倍数放在形容词或副词比较级的前面。如：This classroom is three times larger than our office这间教室是我们办公室的四倍/你我们办公室大三倍。
小题8:what it was 宾语从句：what引导宾语从句，宾语从句用陈述语序，同时采用了强调句型的特殊疑问的陈述语序形式，如：Tell me where it was that you met your first teacher告诉我你是在哪里遇到你的启蒙老师的。
小题9:should have started earlier 情态动词与完成时连用：should have done应该已做但未做，如：We should have done the work better我们应该已将这事做地更好。
小题10:where you can enjoy定语从句：先行词为表示地点名词，定语从句中缺少地点状语，故用where引导定语从句。