Please excuse me _______ your letter by mistake.
I threatened to report the taxi driver for illegally _______ a passenger, but he pointed at his “Not for Hire” sign and drove away.
It is easy for people to ________ the bad habits such as smoking and drinking, which are not so easy to get rid of.
She now has to return home to have a long-time rest at her young age, because her health _____ under the great pressure of work.
________ stopping polluting the earth ________ hope to live in a better environment.
His friends were ___________and encouraged him to publish his ideas, but Copernicus was cautious.