He is the tallest in the class. (同义句) He is __________ than ______________________________ in the class. He is __________ than ____________________ in the class.
Lesson 8 is very difficult. He can't understand it. (同义句) Lesson 8 is __________ difficult __________ he can't understand it. Lesson 8 is __________ difficult __________ __________ __________ understand it.