用适当的连词填空
1. －I called at your house at 7：00 this morning, but nobody answered the door. －Oh, sorry. That was probably________I was out to do some shopping in the market. 答案：when
解析：考查名词性从句。空格处引导表语从句，表语从句中缺状语成分，根据句意可知，引导词在从句中作时间状语，故用when。
2. What I like about Beijing University is________there's a famous lake and an excellent learning atmosphere.
答案：that
解析：考查表语从句。句意：关于北京大学我所喜欢的是，它有一个著名的湖和优良的学习氛围。从句成分完整，故从句用不作成分的连接词that引导。
3. I plan to go on vacation next month. It is uncertain________my best friend has worked out his holiday plan.
答案：whether
解析：考查主语从句。句意：我计划下个月去旅行，不知道我最好的朋友是否制订好了他的出行计划。It为形式主语，uncertain说明有疑问，因此用whether引导主语从句，作句子的真正主语。
4. Parents often find it difficult to win their children's trust and they tend to forget ________they themselves felt when young.
答案：how
解析：考查宾语从句的引导词。句意：事实上父母经常会发现要赢得孩子们的信任非常难，他们似乎忘记了自己年幼时是如何想的。分析句子成分可知，forget后是宾语从句，从句缺少方式状语，表示“如何”，故选how。
5. Report the accident immediately to________is in charge of the project. 答案：whoever
解析：考查名词性从句。句意：把这次事故立即报告给工程负责人。根据句意可知，此处表示报告给“某人”，又因后面的从句中is为谓语，故缺少主语，因此用whoever引导宾语从句，它相当于anyone who, 即相当于anyone为先行词，后面为who引导的定语从句。
6. Energy, passion and a burning desire are, you see, ________true learning takes. 答案：what
解析：考查名词性从句。句意：精力、激情和强烈的愿望乃为真正求知所需。分析句子结构可知，you see是插入语，空格处引导表语从句，并且在表语从句中作take的宾语。
7. ________I am convinced of is________hard work contributes to good results. 答案：What; that
解析：考查名词性从句。分析句子结构可知，is之前为主语从句，在从句中，介词of后面缺少宾语，且指的是内容，故应用what作引导词；而is之后为表语从句，从句成分完整，故应用that作引导词。
8. Can you explain________it is that the sun goes down in the west? 答案：why
解析：考查名词性从句。句意：你能解释一下为什么太阳从西边落下吗？根据题干可知，本句是一个宾语从句，根据“explain”可知，解释的是原因，故选why。本题在宾语从句中使用了强调句型，被强调成分是why。
9. The situation________the weather in London is changeable is within our consideration. 答案：that
解析：考查名词性从句用法。本句中的the weather in London is changeable在句中作同位语从句，而不是定语从句，应该用that引导。句意：伦敦天气多变这种情况在我们的考虑之中。
10. The sun had set, and I was watching________appeared to be the bright glow of a forest fire beyond the mountain.
答案：what
解析：考查名词性从句。句意：日已西沉，入我眼帘的，犹如森林大火般的亮光，自山那边射来。watch后的宾语从句中缺少主语，用疑问代词what表示“……东西”，相当于the thing that...。
11. ________is not yet known is whether robots will one day have vision(视力) as good as human's.
答案：What
解析：考查名词性从句。what引导主语从句并在从句中作主语。句意：机器人是否有
一天能拥有像人一样好的视力还不知道。
12. What affected his decision to drop out of school was the fact________his family couldn't afford the money.
答案：that
解析：考查同位语从句。that his family couldn't afford the money是the fact的同位语从句。句意：影响他作出辍学决定的是他家支付不起学费这个事实。
13. When you get stressed, one of the first things________happen is________blood pressure rises.
答案：that; that
解析：考查定语从句和表语从句。第一空引导定语从句，修饰先行词things，由于things被the first修饰，所以不能用which，要用that；第二空引导表语从句，在从句中不作成分，故用that。
14. I desire to be chosen for the post for________I am inside instead of my family background.
答案： what
解析：考查宾语从句。句意：我希望因我的内在而被选择担任这个职位，而不是因为我的家庭背景。what引导的宾语从句作for的宾语，what在从句中作am的表语。
15. My friend Jack has no idea________he can finish the task on time. 答案：whether
解析：考查同位语从句。句意：我的朋友杰克不知道他是否能按时完成任务。whether引导同位语从句，if不能。根据“has no idea”可知用whether。
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