1) _______________(他们为什么离开家乡去云南) is still a secret.
2) _______________(最让我不解的) was that he spoke English so well.
3) _______________(这么做是故意的) became obvious.
4) It is not clear yet _______________(谁应该为这件事负责).
5) It is none of your business _______________(玛丽与谁订婚).
6) Don’t put off till tomorrow _______________(今天能做的事).
7) This novel is just _______________(我一直在寻找的').
8) It is not yet known _______________(机器人是否有一天能拥有象人一样的视力).
9) _______________(她是否喜欢那个礼物) is not clear to me.
10) My main problem right now is _______________(我是否应该请求另一笔贷款).
11) It all depends on _______________(他们是否会支持我们).
12) You have yet to answer my question _______________(我是否可以指望你的投票).
13) Finally, the workers got an answer _______________(政府做不了什么事来提高他们工资).
14) Obviously, there was little certainty _______________(主席会同意他的提议).
【参考答案】
1) Why they left their hometown for Yunnan
(考点：主语从句)
2) What confused me most(考点：同上)
3) That this was done on purpose(考点：同上)
4) who should be responsible for this matter
(考点：较长的主语从句可以后置，用it作形式主语)
5) whom Mary is engaged to(考点：同上)
6) what can be done today
(考点：宾语从句)
7) what I have been looking for
(考点：表语从句)
8) whether/if robots will one day have vision as good as human vision
(考点：whether/if引导后置的主语从句)
9) Whether she likes the present
(考点：whether引导前置的主语从句)
10) whether I should ask for another loan
(考点：whether引导表语从句)
11) whether they will support us
(考点：whether引导宾语从句)
12) whether I can count on your vote
(考点：whether引导同位语从句)
(9-12中的whether不可以替换为if)
13) that the Government could do nothing to raise their wages
(考点：同位语从句)
14) that the chairman would agree to this proposal(考点：同上)
书香门第
