It was along the Mississippi River _______ Mark Twain spent much of his childhood.
Personally speaking, Chinese parents should encourage children more, getting their confidence to _____ .
To our relief, the European company expressed their ____ to co-operate with us.
Yesterday, my father was so lost in his thoughts that he didn’t realize he ____ the red lights.
A bird is known by its song, and a man by his _____.
When I got into the office, I found Mr. Green ____ in his work, without noticing my arrival.