The field research will take Joan and Paul about five months; it will be a long time _________ we meet them again.
The Voice of China has set up a big stage for young people with a talent for music, ________ some of them have stood out among others.
Williams shows some challenging means ________ diners at their mystery lunch on Sunday might eat the special dish.
That scientist ________ work is successful has been made a model worker.
Many athletes are clear that the Olympic Games are the only time ________ they will be watched by thousands of millions.
The old man often looked back on the past days ________ he worked hard to make a living.