The price of oil has _________ sharply to $12 a barrel.
Who was it _______ wanted to see me just now?
Do you think the reason _______ he gave is believable?
_______ his membership card, Tony decided to make a phone call to check whether there was something wrong.
It’s years since I _______ him last time, and I haven’t written back to him.
Thank you for your timely help; otherwise we _______ in great trouble now.