—I think it’s polite _________ the young to offer seats to the old.

—Yeah, and it's necessary _______ us to do so.

In America, Father’s Day is ________ the third Sunday of June.

Please wake me up _________ 5 o'clock. I have to catch the early train.

The man tried several times to start the car and he succeeded        .

E-tickets will be used for high-speed trains ________ the country in 2019. Passengers can enter the station by simply using their ID card.

The policeman was surprised            the news.

On April Fool’s Day，people enjoy playing tricks _________ their friends.

No one likes a person            bad manners.

_____ the Hope Project started, it has helped thousands of students return to school.

He had to sell newspapers          seven.

—All of our classmates ______ Jack are going to the welcome party for foreign students on Saturday.

—I guess that’s because he will have to join in the speech contest that day.

—How do you learn English so well?

 —________ chatting with my uncle in America on line.

—How do you study _______ a test?   

—I study by working _______ my partner.

Jack has something important to do this afternoon . so he can’t attend the meeting____.