Complete the text by choosing the correct words

B. Complete the text by choosing the correct words. 
improvements, process, brochure, stage, innovation, manufacture ( đây là những từ cần điền vào chỗ trống)
An inventor's guide
So, you think you’ve finally come up with the invention that will change the world! Do you think that all those hours spent making___________ to your original design and testing, re-testing and testing yet again are about to pay off? Well, before you start counting all that money you think you’re going to receive for your fabulous ___________, you’d better think again. You see, it’s a sad, but true, fact that the ___________ of getting something new on the market is a long one. Inventors must travel a rough and rocky road to get from the early development ___________ to the all-important commercial licence of their invention. So, before you’re left with a cellar full of worthless gadgets that you simply cannot get rid of, consider the following carefully

• Make a list of possible companies which might want to ___________ your product.

• Send a letter, or even better, a(n) ___________ describing your product to the companies on your list.

Finally, be patient, stay calm and never stop inventing. Even Alexander Graham Bell had his bad days!
Giúp mình với. Thank you