Choose the most accurate continuous tense to complete the sentence: 'Do not disturb the head researcher; he ___ inside the laboratory since early morning.'

Select the sentence written correctly in the past perfect tense:

She _____ her homework before dinner yesterday.

By next year, he _____ his degree.

He has been working here _____ ten years.

I have lived here _____ 2015.

It was raining yesterday, so we _____ out.