Rewrite sentences without changing the meaning

It’s educational to watch this channel.

Each sentence has a mistake. Find it by choosing the letter A, B, C or D.

I was merely questioning weather we had the money to fund such a project

Each sentence has a mistake. Find it by choosing the letter A, B, C or D.

Do they play any other sports beside basketball and volleyball?

Each sentence has a mistake. Find it by choosing the letter A, B, C or D.

We'll see you after the performance or give you £50 for the tickets, however much they cost

Each sentence has a mistake. Find it by choosing the letter A, B, C or D.

Could I speak to whomever is in charge of this project please?

Each sentence has a mistake. Find it by choosing the letter A, B, C or D.

We knew a lot of about the topic already, but his talk was interesting though.

Choose the letter A, B, C or D to complete the sentences with given words

You/ can/ watch/ The Pig Race/ this/ channel.

Choose the letter A, B, C or D to complete the sentences with given words

We/ watch/ documentary/ know more/ historical events.