We should spend as much time as we _______ over our lessons.
— What’s that terrible noise? — The boys _________ for a party.
Every minute is made full use of _________ our lessons before the exam.
Help is needed for families _________ homes were destroyed during the earthquake.
Adam behaved _________ he had never heard such a thing before.
Jason has lost his job and is now _________ a very difficult time.