Science and technology is changing fast nowadays. I bought this MP3 player at the beginning of this year but now it's out of________.
Not until I began to work______ how much time I had wasted.
It is an interesting old document but there are a lot of words I can”t .
Only ____ as a volunteer ____ how important it is to grasp English.
Yesterday Jane walked away from the discussion. Otherwise, she ____ something she would regret later.
Had you taken the doctor’s advice yesterday, you ____ all right now.