Tom：Mum,I___a good time at the dinosaur Museum this morning.
Mum:Really,my boy/Tell me something__________it.
Tom:Well,Ilike Stegosaurus(剑龙）.It was very long.It______a______head.
Mum;Did it ________on four legs_____tow legs?
Tom:It walked on four legs.
Mum;So it must heve walked very fast.
Tom:NO,it walked_____because it_______heavy and its legs________short.
Mum:Oh,I see.I think Iknow what is looks___________.
打得好累啊,我不要错的答案