I didn’t hear the telephone ringing. I _____.
Mary is the only one of the teachers who __________ a little Chinese because she is one of my friends who __________ been to China.
Joan is one of the best writers who __________ published a lot of books.
It is the first time that I __________ the video of Gangnam Style.
I have heard a lot of good things about you __________ I came back from abroad.
John thinks it won't be long __________ he is ready for his new job.