What is the masculine gender of the word "seamstress"?

Change the Sentences as directed:

Men eat rice (Passive voice)

Fill in the gaps with appropriate Preposition:

The teacher is sincere____his duties.

Fill in the blanks with appropriate words :

He knows how---swim.

Change the following voice:

The science exhibition was opened by the principal.

Make sentences with the following idioms and phrases:

By hook or by crook