This is the desk, ______desk is broken.
Psychological studies show that some people are quick-tempered _____.
The _____ stuck on the outside of the envelope said "By Air".
It was the largest experiment we had ever had; it _____ six hours.
I have been looking for this book for months, and _____ I have found it.
He offered to _____ her a hand as the suitcase was too heavy for her to carry.