1．I truly believe__that__beauty comes from within.
2．Reading her biography，I was lost in admiration for __what__Doris Lessing had achieved in literature.
3．A ship in harbor is safe，but that"s not __what__ ships are built for.
4．If you swim in a river or lake，be sure to investigate __what__ is below the water surface. Often there are rocks or branches hidden in the water.
5．The family was rather poor but the honest man decided to give the bag to its owner. He gave it back to Sam and asked him to check__whether/if__the bag had 50 gold coins.
6．He has heart disease. That is__because__he has been smoking too much.
7．People who visited me used to ask me__how__I could sleep.“Doesn"t the sound of the traffic bother you？How can you get used to so much noise？”
8．We know from the survey on cigarettes __that__ warning messages on product containers and in ads can affect consumption of potentially dangerous products.
9．Following the decline in house prices in many small and medium－sized cities, there are now signs __that__ house prices in major cities may also be set for a slide.
10．Tens of thousands of people marched to the Martin Luther King Jr. Memorial, celebrating the 50th anniversary of King"s famous speech, through which we know __what__ he said meant to the black.
11．New plans for the college entrance examination in Zhejiang are __that__ students have to be tested on Chinese, math, English and another three subjects as they prefer.
12．There is a strong possibility __that__ man will mainly depend on solar energy in the future.
13．As John Lennon once said, life is __what__ happens to you while you are busy making other plans.
14．__When__ the delayed flight will take off depends much on the weather.
解析：句意为：延误的航班将何时起飞主要取决于天气。分析句子结构可知，depends much on是句子的谓语，________ the delayed flight will take off是句子的主语，设空处引导主语从句。根据句意，设空处在主语从句中作时间状语，故填when。
15．__That__mathematics is one of the most useful sections in human knowledge is widely accepted.
16．The bride and groom gave __whoever__ attended their wedding some gifts to share their happiness.
17．I couldn"t imagine __how__difficult it was for these badly injured victims to make it to the hospital.
解析：句意为：我无法想像这些严重受伤的受害者能成功到达医院该有多么困难。设空处引导宾语从句，空后是形容词difficult，应该用how修饰，how difficult it was意为“这是多么困难”。
18．Grandma pointed to the hospital and said, “That"s __where__ I was born.”
19．Some people believe__whatever__has happened before or is happening now will repeat itself in the future.
20．—Is it true that Mike refused an offer from Yale University yesterday?
—Yeah, but I have no idea__why__he did it; that"s one of his favorite universities.
I like reading very much. My classmates" question is __1. when__ I began to love reading. Actually, I love reading as a child. I grew up in a college town and I spent all my summer vacations in this university. What I meant was __2. that__ I was surrounded by libraries and the people who loved to read. __3. That__ I went to the library to read every day was one of my favorite hobbies. My love of reading was credited with the fact __4. that__ my parents only let me watch an hour of TV a day. I learned to entertain myself through my mind and imagination. It"s not really surprising __5. that__ literature became my vocation.
Recently I have been reading a lot of multicultural women"s legends. Jane Goodall went to Africa and studied chimps instead of going to university. __6. Whether__ there are some connections between chimps and human beings puzzles me a lot. Thanks to Jane Goodall, her research showed me the answer. She argued __7. that__ wild animals should be left in the wild and not used for entertainment. After finishing her story, I still have some doubts __8. how__ she could achieve great success on her own in the forest. Lin Qiaozhi, a doctor, became a specialist in women"s illnesses. She devoted all her life to medical work for Chinese women and children. __9. What__ made her succeed later on was the kindness and consideration she showed to all her patients. __10. Why__ she didn"t choose to have a family of her own is clear to me now.
1．I didn"t know what one to buy because these books were all useful to me.
2．You want to know that everthing is going in our school.
3．The problem is what the “Play” doesn"t work at all.
4．There is no doubt whether I will achieve great progress in English learning with your assistance.
答案与解析：whether→that 否定句或疑问句中doubt后的从句用that引导，肯定句doubt后的从句用whether/if引导。There is no doubt that...“毫无疑问……”。
5．At that time, I just wondered that my mother was so delighted.
6．Which is worse, they spat and even threw rubbish into the lake.
答案与解析：Which→What What is worse是固定用法，意为“更糟糕的是”。
7．I went up and asked what I could help them.
8．As is known to all that millions of graduates crowded into the job market each year.
答案与解析：As→It 本句是一个it作形式主语，that引导的从句作真正主语的句子，故改为it。如果用as，则为As is known to all, millions of graduates...。
9．That you should learn is how to write down the most important words, not the whole sentence.
10．The main reason for this was because my mother didn"t know how to cook anything when she got married.