Most children begin to go to school at the age of seven同义句

Most children begin to go to school at the age of seven同义句
Most children begin to go to school when they're seven____
Be careful ,or you'll make mistakes.同义句
If_ you __aren't___ careful ,you'll make mistakes
不是don't
Run faster and you’ll catch the bus.【同义句
__If ___ _you____ __run___faster ,you'll catch the bus.
If you don't work harder,you will fail the exam.[同义句
___Work_ harder,___or_ you'll fail the exam
春天到了,我们应该多在户外活动.
Spring is coming .We should take more activities__in__ __the__ _open____ _air_____

1, when they're seven
2.if don't
3,if you move
4,work,or
5,in the open air,

when they'er seven
aren't beif you run
work or
which are open air

1. in their 7-year-old
2.If aren't
3.If you run
4.Work or
5.out in the outdoors