нужная степень сравнения прилагательного/ наречия.
1. His plan is (practical) of all.
2. London is one of (large) city in England.
3. It is one pf (important) questions of our conference.
4. Your English is (good) now.
5. Even (long) day has an end.
6. It was (bad) mistake I`ve ever made.