271. Wait for me for a few more minutes. I am _____ to a letter from one of my former classmates at college and will finish writing very soon.

living in America for over 20 years, Brother Sway saidto a reporter the other day, “I ________ done bigger things, had biggerachievements had I stayed in China.” .

Nicotine is a drug(药) that gets one into the ______________ of smoking.

many times, my elderly mother still can’tremember how to light the gas

_________ first time I met him in his office, he shook me by _________ hand warmly and then introduce himself to me.