His proposal is so idealistic that there are many    difficulties in putting it into practice． 

It is ___________ that theQing Tombs are influenced by the Ming Tombs, especially architecture and the way they are placed among the surrounding mountains and valleys.

Every morning at a ________ time after breakfast she gave him an hour’s lesson.

He is perfectly __________ to live in the mountains and paint pictures all day, even though he is of poor health.

—George is a wise person .—But in my opinion , he is         than wise .