A new technique ____ out, the yields (收成) increased by 20% .
He shut the window with such force ________ the glass broke.
—Did you know any Chinese before you arrived in Beijing?—Never ________ it, actually.
My pen friend and I keep in touch ________ sending e-mails often.
—Thanks for your help, but can you do me one more favor, please?—________, Sir.What’s it then?
He ________ comb his hair at the table, even though he knows I don’t like it.