'No problem' challenges you on Negatives.
Positive statements are one thing ... but how confident are you when dealing with Negatives? As with so many other structures, negatives in English may work differently from those in your own language, and at this level you'll need to do more than just say 'no'. Try these!
The first six Questions have three Answers which say more or less the same thing and are OK in English, so you need to pick out the one that's not so good or clear; the last few (i.e. from Question 7 onwards) only contain one good Answer, so you must pick out just that one.