1.an. I have never written such an easy  test.
2.a. I have never had such a comfortable furniture.
3.a. I have never seen such a deep lake.
4.a. I have never eaten such a tasty food.
5.a. I have never had such a bad meal.
6.an. I have never met  such an angry girl.
7.a. I have never taught such a clever boy.
8.a. I have never seen such a dirty clothes.
9.a. I have never answered such a difficult question.
10.a. I have never translated such a silly text.