velopment of industry has been ____gradual process throughout _____ human existence, from stone tools to modern technology.

Passengers will likely face the usual struggle to get their tickets during festivals, __________ at railway stations, where long lines are expected

We used to _____every day when we were children.

Whether we can finish the task on time or not will _______ the weather.

resident, accompanied by hisassistants, ______.