The Changjiang River is the longest river in China.(改为同义句)
The Changjiang River is ()()()()river in China.
The Changjiang River is ()()()()river in China,(两个要不一样)
（ps：我填的分别是 longer than any other the first long in ）
Many birds live in the trees over 30 meters from the ground.
Many birds live in the trees ()()30 meters from the ground.