Nouns: relationship, scientist, structure, researcher, observation, influence, invention, development, production, television, communication, computer, temperature, producer, dictation.
Adjectives: mathematical, systematic, general, scientific, natural, social, technical, numerous, industrial, different, digital, physical, international, electric, electronic.
Adverbs: experimentally, closely, generally.
b) research, researcher, experimentally, experimental, experimenter, closely, closer, invention, searcher.
1. to feel --> felt --> felt.
2. to pay --> paid --> paid.
3. to run --> ran --> run.
4. stand --> stood --> stood.
5. to tell --> told --> told.
6. to meet --> met --> met.
7. to give --> gave --> given.
8. to begin --> began --> begun.
9. to think --> thought --> thought.
10. to teach --> taught --> taught.
11. to sit --> sat --> sat.
12. to have --> had --> had.
13. to come --> came --> come.
14. to read --> read ( читается red ) --> read.
15. to sleep --> slept --> slept.
16. to bring --> brought --> brought.
17. to find --> found --> found.
18. to cost --> cost --> cost.
19. to drive --> drove --> driven.
20. to go --> went --> gone.
Объяснение:
Christmas
ice – skate
day
father
Figure skating
won
Canada
first
Объяснение: