________Hard you may try, you can’t possibly persuade Tom to give up smoking, for he is so addicted to it.
The visitor asked to have his picture taken ____ stood the famous tower.
If the man is only interested in your looks, ____ just shows how shallow he is.
So long as Peter goes all out to do the work, I don't mind how long it _____ him to complete it.
—This book is ______ more useful for us students. —Yes, but it is _____ too difficult.
It is required that each of the students chosen _____ good preparations ahead of time.