It will be five years ____ we meet again.
—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.
Dear me! Just _________ at the time! I _________ no idea it was so late.