1. Spectator: Audience
2. Preface: context
3. Adventure: quest, journey
4. Illustrate: Explain
5. Occasionally: Seldom
6. Composition: to compose, to collect
7. Intuitive: instinctive
8. Fascinating: Charming, beautiful, attractive
9. Adapt: Muwafiq hona, to sync
10. Restricted: restrain, to stop something
11. Narrow: short
12. Cite: reference
13. Tantalize: tease, torture
14. Subatomic: very small
15. Sustained: undergo, suffer, strengthen physically
16. Unpleasant: bad, ugly, irritating
17. Aficionado: Nerd, Intelligent, expert, skilful
18. Precise: concise, to the point
19. Testimonials: appreciation
20. Delight: Happiness
21. Unanticipated: Against the expectation
27. D
28 B
29 G
30 C
31 B
32 E
33 A
34 F
35 Beginner
36 Arithmetic
37 intuitive
38 scientists
39 experiments
40 theorems