It was not rare in ______that people in ______fifties went to university for further education.
I lost a book, ______I can't remember now.
You're the only person ______I've ever met ______could do it.
.In our factory there are 2,000 workers, two thirds of ____are women.
The letter is from my sister, ______is working in Beijing.
—I‘d like a pen which _________ well. —Will this one _________?