1: large group of many kinds of things
2: 'accidentaly' - accidentally
3: (this is just a random example, there are many answers) My mother - who always wears a bowtie - doesn't have enough time to volunteer at school.
4: he - subjective
5: bleak
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1: (this is just a random example, there are many answers) faster
2: D (I think...)
3: (these are just random (medical XD) examples, there are many answers) Orthopedic, dentist, hepatic, respiration, psychology.
4: 'they' - replace 'they' with 'the identical children'
Hope this helped! c: