The students are having a （化学） class in the lab．
After working for several hours，he was t and fell asleep soon．
Bill u gets home at 6：00，but today he didn't get home until 7：00．
As we know，the m goes round the earth．
country her eleven love introduction
76．Pandas are so that they are popular with many people．
77．Mr．Wang's home is on the floor of this building．
78．China is one of the biggest in the world．
79．Welcome to our city!Let me some places of interest to you．
80．﹣Is this new watch Ann's？
﹣Yes，it's ．