It was Li Ming ___________ saved the boy.

It’s his brother __________ never been to Australia. You’d better take him with you.

---Who is the boy ________ is playing football over there?
---The one over there? It’s Jim.

—Why do you like the panda best in this zoo?
—Because it’s the only animal ______ comes from China.

I spent all my free time ________ speaking English.

I____10 yuan on this book last year.

The problem is      difficult      few students can work it out.

—Jim enjoys listening to pop music.
—  _________________.

I found _____ necessary to save energy and protect the environment.

David finds ＿＿＿ difficult to communicate with his parents
A.one               B.it                 C.thi