One possible version:
Dear Tom,
I am writing to invite you to visit China Science and Technology Museum next Saturday. We are going to meet at our school gate at 8 am. In the museum, we can see many exhibitions and gain scientific knowledge. We can watch robots give performances and learn how the machines work. And we can also do some experiments by ourselves. When we are in the museum, we should talk in a low voice. Besides, eating or drinking is not allowed in the exhibition halls. Please come and join us . I’m sure you will enjoy the trip. I am looking forward to your early reply.
Yours,
Li Hua
One possible version:
Dear Tom,
I am writing to invite you to visit China Science and Technology Museum next Saturday. We are going to meet at our school gate at 8 am. In the museum, we can see many exhibitions and gain scientific knowledge. We can watch robots give performances and learn how the machines work. And we can also do some experiments by ourselves. When we are in the museum, we should talk in a low voice. Besides, eating or drinking is not allowed in the exhibition halls. Please come and join us . I’m sure you will enjoy the trip. I am looking forward to your early reply.
Yours,
Li Hua