If they had known what was coming next, they_____ their mind.[ ]

I have to reschedule the appointment with you since there is a ________ in my plan.

We drove to the airport to meet an expert from Germany, about 50 years old, his hair ________.

Is this your notebook — No, it isn’t. Ask Bill. He is looking for _____.

My sister seems to prefer _____ music to _____ me.