Tom is a promising student. I am sure that with his________effort, he will make a very successful scientist.

Nowadays, people get news around them and about the world from _____ media: on TV, on the radio, in the newspaper or on the Internet.

     students are required to take the boat race.

It was __of the millionaire not to donate even a penny to charily．

—If you go to the post office，would you please get me a stamp？　　 —I am ______ willing to.