___ he has finished writing the novel is unknown.
Hiking is ____ great fun. You will get close to _____ nature and take exercise at the same time.
Start out right away, _____ you’ll miss the first train.
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.