1.Changjiang is one of the longest rivers in the world
2.The apple is the biggest on this table
3.The box is the largest in the room
4.The mountain is the highest in this city
5.The mouse is the smallest in the hole
6.The pairs of shoes is the lightest in the floor
7.The ship is the heaviest in the harbour
8.He is the youngest student in the school
9.Today is the hottest in this week
10.She is the fattest in her class