Gone are the days ________ we spent together in the mountainous village.

The bus hit against a tree in the fog and __________tothe deep valley, with ten passengers killed and twenty wounded.

_____I stay with you?— Well, I would rather you _____ me alone for a while. [ ]

How are you getting on with the work?——So far it _____ easy but things may change

What we all know is that new technology is being ________to almost every industrial process.