1) Why they left their hometown for Yunnan
　　(考點：主語從句)

　　2) What confused me most
　　(考點：同上)

　　3) That this was done on purpose
　　(考點：同上)

　　4) who should be responsible for this matter
　　(考點：較長的主語從句可以后置，用it作形式主語)

　　5) whom Mary is engaged to
　　(考點：同上)

　　6) what can be done today
　　(考點：賓語從句)

　　7) what I have been looking for
　　(考點：表語從句)

　　8) whether/if robots will one day have vision as good as human vision
　　(考點：whether/if引導后置的主語從句)

　　9) Whether she likes the present
　　(考點：whether引導前置的主語從句)

　　10) whether I should ask for another loan
　　(考點：whether引導表語從句)

　　11) whether they will support us
　　(考點：whether引導賓語從句)

　　12) whether I can count on your vote
　　(考點：whether引導同位語從句)
　　(9-12中的whether不可以替換為if)

　　13) that the Government could do nothing to raise their wages
　　(考點：同位語從句)

　　14) that the chairman would agree to this proposal
　　(考點：同上)