So lost in their computers____that leaders at summer computer camps often have to force them to break for sports and games.
With the rapid development of the city, he can hardly find the place __ he used to play with his childhood friends.
— I'm leaving tomorrow. — Oh, what a pity! I won't be able to see you off. I __ a tele-conference the whole morning.
__ is not possible that Bob can win the first prize in the competition.
— How come you are here? — I came here for nothing else but to see you ____.
I didn't see your sister at the party. If she __, she would have met my brother.