—          do you surf on the Internet?—Once every week. I watch some latest news and chat with my pals there.

– __________ milk do you need for the milk shake?– Well, one cup is probably enough. 

I suppose he ought to have known that,________?

There is a beautiful lake in this city,      ?

— I telephoned him twice and I couldn’t get through to him.  —The line might have been out of order, _______?