19. It’s quite an informal gathering ; you needn’t ______for it .
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.
Only when something gets lost _____________.