_______ a doctor, we should do what we can _______ every patient’s life.

[　　]

When I got off the bus, it happened _______.

[　　]

I am sorry I forgot _______ the dictionary. May I use yours?

[　　]

How _______ the problem will be discussed soon.

[　　]

______ two exams to worry about, I have to work really hard this weekend.

[　　]

In the reading room, we found her ______ at a desk, with her attention ______ on a book.

[　　]

______ a large family to support, I have to work really hard.

[　　]

He had never spent a ______ day.

[　　]

It is very likely that we may get ______ the trouble.

[　　]

Who is considered ________ the telephone, do you know?

[　　]