(一)
1. ________Li Bai，a great Chinese poet，was born is known to the public，but some won't accept it.
解析：句意：李白是中国一位伟大的诗人，他的出生地是众所周知的，但有些人不愿接受这一事实。分析句子结构可知，a great Chinese poet做Li Bai的同位语，is前面是主语从句，where在主语从句中作地点状语。
答案：Where
2. If you swim in a river or lake，be sure to investigate________is below the water surface.Often there are rocks or branched hidden in the water.
解析：句意：如果你在河里或湖里游泳，一定要调查水下有什么东西。(因为)经常会有些岩石或树枝暗藏在水里。动词investigate后的宾语从句中缺少主语，故填what。
答案：what
3. We must find out________Karl is coming，so we can book a room for him.
解析：句意：我们必须弄明白卡尔什么时候来，为的是我们能给他预定房间。find out 后面跟着宾语从句，根据句意填when。
答案：when
4. A ship in harbor is safe，but that's not________ ships are built for.
解析：句意：船停放在海港里是很安全的，但这并非建造船的目的。isn't后跟从句作表语，表语从句中的for后缺少宾语，用what引导，what与for连用，表示目的。
答案：what
5.—I wonder ________ Mary has kept her figure after all these years.
—By working out every day.
解析：句意：——我好奇玛丽在这些年是怎么保持着身材的。——通过每天锻炼。句中I是主语，wonder是谓语，how引导的宾语从句在整个句子中做宾语。连接副词how是宾语从句中的方式状语。句子是用表示方式的介词by回答的，所以是针对方式提问的，故用how。
答案：how
6. You have to know________you're going if you are to plan the best way of getting there.
解析：句意：如果你要计划到达那里的最佳路线，你就必须知道你要去哪儿。根据句意可知，此处应用where引导宾语从句，在从句中作地点状语。
答案：where
7. Reading her biography，I was lost in admiration for________Doris Lessing had achieved in literature.
解析：句意：读完了她的自传后，我对Doris Lessing在文学上做出的贡献非常敬佩。介词for后面是宾语从句，从句中缺少宾语，所以填what。
答案：what
8.(2014·山东卷)It is difficult for us to imagine ________ life was like for slaves in the ancient world.
解析：句意：我们很难想象古代奴隶们的生活是什么样子的。根据分析可知在该空引导的宾语从句中介词like后面缺少宾语且设空处表示“事物”，所以填what，用来引导宾语从句。
答案：what
9.—Is it true that Mike refused an offer from Yale University yesterday?
—Yeah，but I have no idea ________ he did it;that's one of his favorite universities.
解析：句意：——迈克昨天拒绝了耶鲁大学给他的录取机会，这是真的吗?——是的，但是我不知道他为什么会这样做，那可是他最喜欢的大学之一。根据句意填why。why引导同位语从句。
答案：why
10. Grandma pointed to the hospital and said，“That's ________ I was born.”
解析：句意：奶奶指着那家医院说：“那就是我出生的地方。”本题考查表语从句。根据句意可知该空应该填表示地点的连接词引导表语从句，故填where。
答案：where
(二)
1.We have learned from the story that________is most valuable is not what we have in our lives but________we have in our lives.
解析：句意：从这个故事中我们知道了最有价值的不是我们在生活中有什么东西而是生活中的人。“________is most valuable”为主语从句，根据句意可知，该主语从句缺少主语且表示“事物”，故第一空答案为what;“________we have in our lives”为表语从句，该从句缺少宾语且指“人”，故答案为who。
答案：what;who
2.________he considered a great proposal was turned down by the boss at the meeting.
解析：句意：他那个自认为很不错的提议被老板在会上否决了。“________he considered a great proposal”为主语从句，consider在句中的用法是：consider+宾语+宾语补足语。由此可见该主语从句中缺少宾语(considered的宾语)，又因为设空处表示“事物”，故答案为what。
答案：What
3.Choosing the right dictionary depends on________you want to use it for.
解析：句意：选择对的词典取决于你想用它来做什么。“________you want to use it for”为宾语从句，该从句缺少宾语(介词for的宾语)，且设空处表示“事物”，故答案为what。
答案：what
4.With many cities in China dreadfully blanketed by thick haze，the environmental problem is________Chinese people concern most nowadays.
解析：句意：随着中国许多城市被厚厚的雾霾所笼罩，环境问题成了当今中国人最为关注的问题。“________Chinese people concern most nowadays”为表语从句，该从句缺少宾语(concern的宾语)且设空处指“事物”，所以填what。
答案：what
5.Dozens of people were waiting with a camera for________ seemed like hours，hoping to catch a glimpse of the U.S.First Lady，Michelle Obama.
解析：句意：很多人拿着相机等了好像有几个小时了，希望能够一窥美国第一夫人米歇尔·奥巴马的真容。“________seemed like hours”为宾语从句，该从句中缺少主语，且表示“事物”，所以用what。
答案：what