—Guess what? Tom has failed in the exam ____ second time.—How come? He is ___ second to none in English in our class.
_____________ on the portrait, mother was deep in thought.
An average of 130000 Chinese _________ abroad for studies every year over the past few years, boosting exchanges in the educational fields
---- I can’t get through to the general manager’s office anyhow. ---- The line is busy. Someone ___________ the telephone.
As we all know,________, the pollution will get worse and worse.
There was a fierce debate about _____we should go on with experiments on creating new life.