. --- Believe it or not, I passed the driving test at the first attempt yesterday.--- Great! But remember you can never be ___ careful when driving a car in the street.

I often thought of my childhood,             I lived on a farm.

She devoted herself ______ to her research and it earned her agood reputation in her field.

She claimed _____ that she would never break her words.

—How did you sleep last night? — Oh, I slept like a log last night. What does the underlined part mean?