"Buy two kilograms of tomatoes."

Translation: Купи два килограмма помидоров.

[vadimfowler]

My answer was "купи два килограмма помидор"... but I am not 100% sure that it is a grammatically correct option... many people would say so though.

[bright_flash]

Yes, you have to use Genitive plural there, because the English construction "X of Y" is usually replaced by Y being in Genitive in Russian.

[LukaJovic1]

I guess it should be помидоров, since it's genitive plural, but I might be wrong

[Shady_arc]

The course is not meant for native speakers of Russian. If you speak Russian IRL you should double check your language is standard and you do not use a questionable word order.

[vadimfowler]

Good point about the native Russian speakers ;) I was merely checking, because I am about to recommend this course to a few of my friends... and because I thought that the comments may be necessary for the course to graduate from beta-version.

Seriously - great job, guys!!!

[neil51]

Should томатов also be acceptable instead of помидоров?

[Shady_arc]

I added that. I do not think it is that bad.