—Who do you think ________the book here?—It may be John.He was sitting here all the morning.
Smoking is one of the ________causes of cancer,killing millions of people each year.
In a sports team each player has a clear role,and there are few occasions ________members are confused or uncertain about their roles.
—I’m green at everything. —Don’t worry. ________you get older,you will get more experience.
As a film star she was a success,but as a wife she was ________failure,so their marriage ended in ________failure.
—You are late again,Tom?—Sorry,but I got ________a heavy traffic jam.