“掩耳盗铃”是大家非常熟悉的故事，从物理学角度分析盗贼所犯的错误是：既没有阻止声音的____，又没有阻止声音的____，只是阻止声音进入自己的耳朵．
I don't know if Tom _________ here tomorrow. If he ________, I'll tell you.
New year is coming, we should make resolutions ________ the beginning of the year.
