It is no use _________ to persuade him ________ smoking because he has been addicted to it since he wasyoung.
Nobody can explain the mystery ____ he suddenly disappeared.
It suddenly___ to me that we could use the computer to do the job.
Though she _______for a moment, she finally went in and asked to see a dress that was in the window.
The survey shows that a large number of teenagers are ________ cigarettes nowadays.
Rita _________two hours every Sunday afternoon to spend with her son.