---Do you know why people set off fireworks ? --- Well, in ancient China, people set off fireworks on New Year’s EVE that the loud noise could drive away bad spirits .
I often go swimming with my father______Sunday.
Betty is in front of me,so I am ________Betty.
There’s______old pencil on the book. The pencil is _____pencil.
--_______students are there in your class,Mr Li? --Fifty.
---How’s your mum? ---She’s ________.