这些个词形变换题怎么做?

这些个词形变换题怎么做?
4. The audience [4] liked the play because they applauded for two minutes at the end. (evident)
6. [6] must be instilled in children when they are young, (honest)
8. Little Bill found it hard to memorize the [8] laws his teacher taught. (physics)
10. Young people can no longer look forward with any [10] to a career or even a job. (certain)
13. Mr. Hobbs was annoyed at his son's [13] of mind in doing everything. (absent)
14. They finally reached an agreement that was [14] to both sides. (accept)
15. Quite a number of social [15] take up too much of his time. (active)
16. They need [16] help to get the work done as scheduled. (add)
20. When you are learning a foreign language, it is [20] to practice as much as possible. (benefit)
21. Dr. Smith is a well-known [21] in this country. (biology)
22. Her eyes [22] with pleasure when she saw the bunch of flowers on the table. (bright)
23. The road [23] at the shopping centre of the city. (broad)
24. It's true that travel [24] one's mind. (broad)
25. He looks [25] with that expression. (child)
26. He often acts [26] , although he is a father with a son 15 years old. (child)
27. He was born in China, spent his [27] in England, and now he is an American citizen. (child)
28. He is already 20 years old but still behaves [28] . (child)
29. How cheerful the room looks with so many [29] posters! (color)

4 evidently
6 Honesty
8 physical
10 certainty
13 absence
14 accepted
15 activities
16 to be added
20 beneficial
21 biologist
22 were bright
23 is broad
24 broadens
25 childish
26 childishly
27 childhood
28 childishly
29 colorful