An opening sentence for what!
Any opening sentence depends entirely on what the rest of the writing is about. It is no good having a sentence like this.
The elephant's gestation period is 22 months, the longest of any land animal.
if you are writing about global warming.
It is startling how many sentences are available on the Internet.
A startling statement is one that surprises the listener.
I would like to start with a startling revelation.
Surely you would agree that,Most people would agree that,The fact is that,Sadly,In conclusion
His pants had been mended.
a sentence that tells a fact is a declarative sentence
The Germans gave the Christmas tree to us
An opening sentence
A startling statement is one that surprises the listener.
Startling Stories was created in 1939.
Startling Stories ended in 1955.
Start with something exciting. Maybe a startling fact, an onomatopoeia, or a certain event.