阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
Questioning can lead to ________(search) for an answer. If we are in the habit of raising doubts as to ________ what we are told is true, we can find the correct answer and learn more.
Two years ago, our teacher _________(offer) us an answer to a difficult math problem in class. Although the answer seemed a little strange, nobody _______ I doubted it. Thinking that his answer might be wrong, I _________(careful) analyzed the problem and tries to work ___ out in a different way. Half an hour ________, I managed to find the correct answer. When I showed my answer to him, the teacher praised me for my ________(depend) thinking.
From this experience, I have learned that questioning can serve as _______ bridge that helps us to seek the ______(true).