模仿范例，写一写
例：14+6=" (" 20 )
--How much is fourteen and six?
--It is twenty.  
1. 12+7= (    )
--How much is______________ and______________?
--It is ______________.
2. 16+3= (    )
--How much is______________ and______________?
--It is______________.
3. 15+5= (    )
--How much is______________ and______________?
--It is ______________.
4. 13+4= (    )
--How much is______________ and______________?
--It is ______________.
5. 13+5= (    )
--How much is______________ and______________?
--It is ______________.