---Della, would you like some potato chips? ---No potato chips for me---I’m ______ a diet.
We should consider the students’ request the school library provide more books on popular science.
Professor Williams keeps telling his students that the future to the well-educated.
With the world changing fast, we have something new with all by ourselves every day.
----I’ve got to go now. ---Must you? I you could stay for dinner with us.
Peter was so excited he received an invitation from his friend to visit Chongqing.