Could any one help me to solve the following questions

Identify errors in Correctness and Provide a corrected version in the answer booklet.

Example

We talked about staff promotion and pay raise. Also staff medical benefits and how it affects staff turnover.

Error Sentence Fragment

Corrected - We talked about staff promotion and pay raise. We also discussed staff medical benefits and how it affects staff turnover.

1a) Peter prepares for the exam by revising the notes, watching the recorded lectures, and practising.

Error

Corrected

1b) Having finished his work, the TV was turned on.

Error

Corrected