New Words：

comet ['kɔmit] n. 彗星
firework [ˈfaɪərwɜːrk] n. 烟火;烟花
shooting star 流星

Sample Sentences：

The boys were letting off fireworks.
We went to a firework display yesterday.
We can see comets only when they come close to the earth.
The shooting stars are falling at a speed of 66 km per second.
A comet is a bright object with a long tail that travels around the sun.

object ['ɔbdʒikt] n. 目标；物体；目的；东西

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