It was probably at that moment _____ I understood what kindness really was.
---- How about the party ______ in Tom’s house last night ? ---- I don’t know. I was too busy to attend it.
The boy would rather _______ the story to himself than ______ it with his friends.
---- Why does the river smell terrible? ---- Because large quantities of water______.
Cathy went to the hospital alone. If she had told me about it, I _____ with her.
Of all the books on the desk, ______ is of any use for study.