It was with great delight that I read in your February _____ the letter to the Editor written by Prof. Johnson.
..---Who ________ it be that is knocking at the door?---It________ be Mother, but I’m not sure.
..If you cheat in the exam, you could hardly________ it.
..He once studied in Zhejiang University, ________he went abroad for further study.
..More attention should be paid __________ English.
..More than 60 million people in southwestern China ________the drought nowadays as a result of less rainfall, environmental damage and so on