Always read the label ______ you wash your clothes．
| A．before | B．unless | C．since | D．until |
One of the most popular Korean TV dramas of all time, Dae Jang Geum(《大长今》), _______in Hunan TV Station recently.
| A．will release | B．are releasing | C．has been released | D．has released |
_______ in the regulations that you shouldn't tell other people the password of your e-mail account.
| A．What is required | B．What requires | C．It is required | D．It requires |
The manager, _______ it clear to us that he didn't agree with us, left the meeting room.
| A．who has made | B．having made | C．made | D．making |
I'm moving to the countryside because the air there is much fresher than _______ in the city.
| A．ones | B．one | C．that | D．those |
While watching television, _______.
| A．the doorbell rang | B．the doorbell rings |
| C．we heard the doorbell ring | D．we heard the doorbell rings |