20.He took much pain-killer last night, thus ______ his headache.
.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 _________?
It was not until liberation that _________ to his hometown.
—Why not go out for a walk before breakfast? —Oh,yes. _________ is my favorite time of day.