Use the correct form of the words in brackets.
17. The play was a _____________________ success. (commerce)
18. Alexander Graham Bell ______________ demonstrated his invention. (success)
19. Can I leave the ______________________ of the tables for you. (arrange)
20. Alexander Graham Bell experimented with ways of transmitting _____________over a long distance. (speak)
21. The film ____________ is very attractive. (introduce)
22. The life in the countryside makes us relaxed because it’s very ________________. (peace)
23. She called him about her furniture ________________________. (deliver)
24. Each of my friends has a ____________ character. (differ)
25. You should do your test ____________ if you want to get good marks. (care)
26. There was still no ________________on what to do next. (agree)
27. This river is very _______________________ for swimmers. (danger)
28. My mother told me a very ___________________ story yesterday. (interest)
29. This old man is __________________ in one ear. (deafen)
30. He can play many kinds of ____________ instruments. (music)