请用以下动词的过去式填空补全短文 say be go eat stay take buy have climb see Last summer,Simon______ in China.He_______at Daming's flat.They_____ to the Great Wall and______to the eop.They ______lots of mountains.And they_______biscuits.Simon_____ some photos.He______a picture of the Great Wall.He______,"I'll give it to my father."Simon______a good time.