Part of the reason Charles Dickens loved his own novel, David Copper field, was __________ it was rather closely modeled on his own life.
To save money,____________.
WheneverIwasintrouble,hewoulddowhathecould________me.
According a recent survey, if the factory closes, a lot of people _______ their jobs.
________ hard, and you will pass the final exam.
The past 30 years has ______ the great changes that have taken place in China.