在“轮船航行”“飞机起飞”“气球升空”“潜艇潜水”四个物体的浮沉中，有一个依据的原理与其它三个不同，它是____ ．
29×2＝____
46×2＝____
12×8＝____
Jenny says that this tour____(包括)visit to a science museum．
The sentence structure of "I saw him run into the building" is .
