When Marx was in London, he __ read at the library for hours.
---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?
Tom, yourself. Did you forget the school rules?
The boy was made to the explanation(解释,说明 process of explaining) .
As we grow older, birthdays seem to more quickly than when we were children.
Sports and games can _ our bodies