German student needs your help. (Investigation.)

[OhAh]

HI! :)Here is a letter from my friend Ulrich:

"Dear friends!

I live in Germany and investigate a question about Russian and English idioms. I need your help. Please answer the questions. They are very easy. There are five questions for six idioms, and questions for every idiom are the same. So it wouldn't take mush time to answer them.

Questions are here. investigation

Thank you very much!
Yours sincerely,
Ulrich".

Please if you want to help send me your letters for Ulrich. Thanks!!!

[Tdol]

I've left a comment there.

[OhAh]

Thank you, Tdol!

[Tdol]

On second thoughts, with 'rhino' you also hear 'hide' being used.

[OhAh]

Ok!

[OhAh]

Ulrich needs your help!!! Help him please. He would tell you about the results of his research if you wish.