Don’t be too general. Please give a ______suggestion on how to deal with this difficulty. 

To my surprise, he was lost in thought then and not ____ of my presence at all. 

There is _____ evidence that cars have a harmful effect on the environment.

 With the help of the firefighters ,the workers managed to escape from burning mine , ___________.

He warned us that there would not be ___ gas to cook the meal.