把下面的八字成语补充完整。

攻无不克，____     宁为玉碎，____ 

种瓜得瓜，____     如闻其意，____ 

出其不意，____   

下图为GPS接收机上的信息。读图，回答以下问题。

已知等差数列$\left\{a_n\right\}$，$S_n$为其前$n$项和，若$S_{20}=100$，且$a_1+a_2+a_3=4$，则$a_{18}+a_{19}+a_{20}=$（     ）

将下列句子改为被动语态
(1)I sent a letter to you last month.
____
(2) Do we use it for cooking?
____
(3) Where did you build the bridge?
____
(4) Mother tells me a story every day.
____
(5) Can he finish his homework on time?
____