__________ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
Tom went off to the EXPO Garden with his friends, _____ an exciting day of discovering the unique ( 独特的) culture of each nation.
I regret _____ that I am unable to help you.
---Did the book give the information you need? --- Yes. But _____ it, I had to read the entire book.
My advisor encouraged _____ a summer course to improve my writing skills.
She has always _____ her father. In her eyes he is perfect.