He tried his best to solve the problem, _______ difficult it was.
The children all looked _____ at the broken model plane and felt quite _____.
“This book is ______ more useful for us students.” “Yes, but it is _______ too difficult.”
He said he would return the money, and I was ______.
She looks very _____ but I can’t remember her name.
There was nothing special about this film — it was only ______.