Solution:
Confess -- admit that one has committed a crime or done something wrong.The police made him confess his crime.

Solution:
Sentence is in present perfect tense. Rule : Subject + have/has + been + V3 + other agents.The letter has already been sent. It must have reached by now.

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Solution:
Sentence is in past continuous tense. Rule : Subject + was/were + V-ing + other agents.Sir asked me if I was making mischief in the class.

Solution:
Should you go really? You only arrived an hour ago!

Solution:
Beside --- at the side of; next to.The husband and wife stood beside each other as they shook hands with the guests.

Solution:
We use –ed with simple past tense sentences. 'died' is the correct answer.