The war made _______ impossible for the scientist to go on with his research.
Entering the room, I found Mary _______ at the desk and _______ a letter.
I took my driving license with me on holiday, _______ I wanted to hire a car.
Some parents are just too protective. They want to _______ their kids from every kind of danger, real or imagined.
The sunlight is white and blinding _______ hard-edged shadows on the ground.
He is always full of _______ as though he never knew tiredness.