Can you tell the __________ difference between the words "require" and "request"? I sometimes get puzzled by their meanings.
The boss appeared ______ the accident and was not surprised at the news.
________ a vocation, and you’ll forget unhappy things
---Why do you look so upset?---There are so many troublesome problems _____.
The cancer risks ___________ smoking have been well documented.
They are purely __________ weapons, not designed for attacks.