34+5+7=____     47-8+3=____     52+7-10=____    6×4+1=____

9+4×3=____     7×9-6=____7     81-51+35= ____   6×6=____ 

7×9=____      13-（83-73）=____

In our class, there's a ________ that when it is somebody' s birthday, they bring in a cake for us all to share.

音乐是人们思想的载体之一，具有丰富的内涵，其中蕴含了作者的生活体验，思想情怀。下列三幅图片中的音乐能体现的共同主题是