主題：Sink and float 浮與沉

班級：S-8

單字：sink(下沉), float(浮), water(⽔), drop(下降), boat(船), pin(別針), can(罐頭), feather(⽻⽑), ball(球), toy(玩具)

句子：

1. When an object drops to the bottom of a liquid like water, It’s called ______________. (sink)
2. When an object stays at the top of a liquid like water, It’s called ______________. (float)
3. Which object will float? A feather or a pencil? (A feather)