—What ____ you buy yesterday?
一I bought some ____ and some yoghurt(酸奶).
一Don't eat too ____ hamburgers.
They're junk food(垃圾食品).
在等式□×24+□×30=27,□里可同时填( )
如图用一根结实的绳子在两根光滑木棒上绕几圈,一小朋友用力一拉,两位大力士竟撞在一起了.这幅漫画说明了____。