____ to reach the headmaster on the phone, the student sent an email instead.
—Someone wants you on the phone. —_____nobody knows I am here.
Try____ she might, Sue couldn’t get the door open.
(2012全国新课程)I don't believe we've met before, I must say you do look familiar.
I had hardly got to the office ______ my wife phoned me to go back home at once.
—Look at those clouds!—Don’t worry. ______ it rains, we’ll still have a great time.