_______ is certain, people’s living conditions in China have improved a lot since the 1980s.
| A．It | B．As | C．what | D．Which |
—Did you know any Chinese before you arrived in Beijing?
—Never ________ it, actually．
| A．had I learned | B．have I learned |
| C．I have learned | D．I had learned |
My pen friend and I keep in touch ________ sending e-mails often．
| A．with | B．by | C．on | D．of |
—Thanks for your help, but can you do me one more favor, please?
—________, Sir．What’s it then?
| A．Just a minute | B．My pleasure |
| C．That’s right | D．At your service |
He ________ comb his hair at the table, even though he knows I don’t like it．
| A．shall | B．may | C．will | D．can |
Dear me! Just _________ at the time! I _________ no idea it was so late．
| A．look, have | B．looking, had |
| C．look, had | D．looking, have |