Заполните пропуски в инструкции следующими словами The Work of a Laboratory Assistant 1. You must 1_...: ответ на тест 223456 - Английский язык

Заполните пропуски в инструкции следующими словами
The Work of a Laboratory Assistant
1. You must 1_______ inoculating needles before and after use.
2. You must heat 2_______ in the flame until red hot.
3. You must always 3_______ test-tubes with cultures in test-tube racks.
4. You must wash your hands before leaving the 4_______.