You have to keep alert when you are in the supermarket; otherwise, you might _____ what you actually don’t need at all.

—Were you surprised by the ending of the film?  ----No. I ______the book, so I already knew the story. 

--Is your uncle a pilot? --Yes. He _________ four days a week and has been to many places. 

–Ann is in hospital. ---Oh, really? I _____ know ,I ____ go and visit her.

I_____ violin lessons every two weeks, but I think I ‘ll make it every week from next month.