Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again SARS, so we only had time for a few words.
It was not until I began to work that ______ how much time I had wasted. A did I realize B didn’t I realize C I realizeD I realized
Not until I began to work ____ realize how much time I had wasted.
So loudly _____ that ____ hear her clearly.
Only when the meeting was over___ go back to meet his friend.
Only in this way ____ make progress in your English.