good manners to say “Sorry” when you knock into someone but no need to say it again and again .
A clean environment can help the city bid for the Olympics, which in return will _____its economic development.
We like Jack because he is a man ______everybody thinks is pleasant to _____.
Mary is kind. She is easy to _____.
—Is there any hope of saving her life? —Her injuries are extremely(极其) serious,but she’s expected to _____.
I try keeping the meeting short, ______ to waste everyone's time.