--- Why did you buy two pairs of shoes? --- It was so hard to choose which was________, so I took them both.
My glasses __________ broken last night. Can you help me to repair them?
-Yes, I do. She __________ Big Sister by us and I am afraid of her.
How long have you __________ this book?
The mobile phone has influenced people's life a lot since it __________.
-What do you think of the young woman singer?-It's hard to say, but her voice __________ beautiful.