. He was ill. _____ is why he didn’t attend the meeting.
John opened the door. There _____ he had never seen before.
Mary didn’t understand made her deskmate so upset all the morning.
Every evening after dinner, if not from work, I will spend some time walking my dog.
I _____ Wang Tao in the street yesterday. We _____ each other since he went to Beijing.
—Is the boy your own son? —No. He is an _____ child _____ himself Martin.