French language Q&A Forum

I wrote "faire du ski." I think this is form give elsewhere on Lawless French.  Here the correct answer is given as "faire de ski."   Which is correct?

I already tried submitting this question via the quiz: In a multiple-choice question I was supposed to fill in the answer for Elle est ________ aux jeux de la toupie dans notre groupe, or some such similar question. I got it wrong by selection le meilleur over la meilleur(e) It is not made clear in the the lesson on meilleur vs. mieux why the quiz answer should be la meilleur and not le meilleur. ... After all there may be males in the group considered in the for who is the best at the game."

Bonjour,

Why "1 kilo de tomates" and not "1 kilo des tomates"?

Thank you