.--- I think a design which all the ages and social groups is not easy to make.---I can’t agree more with you.
The boy was made to the explanation(解释,说明 process of explaining) .
---Mum, it is nice weather. I want to skate this afternoon. ---Don’t you think the ice on the lake is too thin to your weight?
As we grow older, birthdays seem tomore quickly than when we were children.
Readers can quite well without knowing the exact meaning of each word.
Sports and games can _ our bodies