question: i liked mathematics, and my father being a mathematician was no reason i should not become one too.
Capitalize this past sentence correctly.
A: I liked mathematics, and my father being a mathematician was no reason I should not become one too.

question: when dealing with animals, leeches can sometimes be a bit choosy. it is therefore advisable to hold ready about twice as many leeches as needed.
Capitalize this past sentence correctly.
A: When dealing with animals, leeches can sometimes be a bit choosy. It is therefore advisable to hold ready about twice as many leeches as needed.

question: notice, that you have to select cells in 2 columns.
Capitalize this past sentence correctly.
A: Notice, that you have to select cells in 2 columns.