1 I know the plural of bacterium' is IRREGULAR but I can't remember exactly what it is. (REGULAR)
2 They're trying to reproduce the chemical REACTION in the lab. (ACTION)
3 Basic knowledge of STEM subjects is desirable for this job, but it's UNNECESSARY for candidates to have many years of work experience. (NECESSARY)
4 The panel decided to give the first INTERVIEWEE the position because she impressed them so much. (INTERVIEW)
5 How did Sholpan OVERCOME her fear of public speaking? (COME)