We teenagers should _____ the old and offer our seats to them on buses.
A. laugh at B. depend on C. care for
－Sir, would you mind speaking a little more ____?
－Of course not. I thought you could follow me.
A. quickly B. slowly C. politely
Last week the old books ______ to raise money for Free the Children.
A. sold B. are sold C. were sold
－How is Lily in the new school?
－She is doing very well. There is ______ to worry about.
A. nothing B. something C. anything
－3-D printing could be used to build a house in less than 24 hours.
－It ______ amazing. It's my first time to get to know this.
A. sounds B. smells C. tastes
－It is necessary _____ people to have food and water every day.
A. of B. for C. with
