Используйте «tough customer» в предложении

1. In other words, it’s a damned tough customer

2. AROSE 4AYLOR WAS FACED WITH TRYING TO REACH SALES TARGETS WITH SOME TOUGH CUSTOMERS

3. The two battleships present were however huge behemoths with very thick armor and were certainly going to prove to be tough customers indeed

4. The man was tall and athletic and looked like he could be a tough customer indeed, while the young blonde beauty besides him could have made most men mad with desire

5. Zion was a tough customer