Word forms 2: nouns from adjectives

Exercise 1:
Look at these sentences and decide if the words in bold are the correct noun form of the adjectives which you will find at the end of each sentence. Correct those which are wrong (otherwise leave blank). Look at the meaning of the whole sentence before you make any changes, and don't forget to check the spelling.

1. Items of valuability can be left in the hotel safe overnight. (valuable)
2. La Poubelle d'Or is the only restaurant in town for those with real taste! (tasteful)
3. Do you have a thirstiness for knowledge? Then why not enrol on one of our evening college courses? (thirsty)
4. It is often said that 'honestly is the best policy', which is why AZ Enterprises have adopted it as their company motto. (honest)
5. It can often be lack of confidence that prevents an employee performing well at work. (confident)
6. Many people who start up their own company are unaware of the expensiveness involved. (expensive)
7. Seniors can travel free on public transportation between 9 in the morning and 4 in the afternoon, although some restrictions apply. (restricted)
8. There are a few similarties between our old TZ18b model and the new TZ20. (similar)
9. The management are unable to say with any certainence when the new changes will be implemented. (certain)
10. Unnecessary absentism from work is costing American companies millions of dollars a year. (absent)
11. Please complete the form and return it at your earliest convenientcy. (convenient)
12. The union has questioned the necessaryness of downsizing, but the management insist it is the only way to keep the company going. (necessary)
13. Despite a relaxation of company rules regarding dress, many still prefer to wear a suit to work. (relaxed)
14. Sometimes in business, rules have to be changed according to needs: flexiblence is the key to success. (flexible)
15. Health and safety issues should be a priority with any organization. (safe)
16. The management accepts no responsibleness for items lost or stolen in the workplace. (responsible)
17. In advertising, accurateness is very important when it comes to identifying the target market. (accurate)
18. The legal profession is often criticized for concentrating on making money instead of upholding the law. (professional)
19. There have been unforeseen complicatenesses with our new building proposal owing to opposition from environmental groups. (complicated)
20. Do you know the differents between net profit and gross profit? Is overtime the same as allowed time? If you answered 'no' to the first and 'yes' to the second, it's time you joined our 'Business for Basics' course! (different)