1. How beautifully she sings! I _____________ ( 这是我听过的最好的) song. ( better )
2. He _____________ (不是在开玩笑) when he said the floor was shaking. ( serious )
3. The doctor said that the patient was suffering from a rare disease and he
_________________(对此无能为力). （ do ）
4．Robert is said _____________________ (在国外学习) , but I don't know what country he is studying in. ( abroard )
5. Everything is in order , so they __________________ (不可能搜查过)the room. ( search )