27. Now and then they would ______ our house and have a talk with us.
To save money,____________.
Whenever I was in trouble, he would do what he could ________ 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.