Here are suggested words in the correct forms to fill in the blanks in your sentences:

18. **identify** - Helen Keller was deaf herself but she could **identify** people's job by the odour on their clothes.

19. **connection** - Helen Keller says that there is a **connection** between smells and memory.

20. **sixth** - My uncle has a **sixth** sense that we call it the sixth sense.

21. **fashion** - Wearing the flared trousers and a loose shirt is the **fashion** of the eighties in Viet Nam.

22. **fashionable** - It was very **fashionable** to wear a loose shirt and flared trousers in the eighties in Viet Nam.

23. **colourful** - The little girl likes wearing a **colourful** dress on her birthday.

24. **inform** - We can get **informed** really quickly thanks to the internet.

25. **amazement** - Pole-sitting was an **amazement** craze in the past.

26. **belief** - It is **believed** that Gary Dahl sold millions of pet rocks.

27. **believe** - I cannot **believe** that Mr. Gary Dahl could sell millions of pet rocks.

28. **specialty** - Beef noodles is one of the most famous **specialties** of Ha Noi, Viet Nam.

29. **sensation** - Which is your strongest **sensation**, hearing, smell or taste?

30. **senses** - How many **senses** are there?

Feel free to adjust as necessary based on context and specific requirements!