Сопоставим слова для образования сложных существительных.
| A | B | Compound noun |
|---|---|---|
| tooth | brush | 1 toothbrush |
| note | book | 2 notebook |
| camp | site | 3 campsite |
| pen | knife | 4 penknife |
| key | chair | 5 keyboard |
| arm | chair | 6 armchair |
Ответ: 2 - notebook, 3 - campsite, 4 - penknife, 5 - keyboard, 6 - armchair