Fred entered without knocking and, very out of breath, sank _______ a chair.
| A．on | B．off | C．into | D．to |
We live in a world that is changing fast, one changes come at what seems to be an ever-increasing pace.
| A．Unless | B．Once | C．Whether | D．Although |
Panda is one of remaining endangered animals in the world.
| A．The; The | B．A; a | C．The; a | D．不填；the |
I was told that there were about 50 foreign students ________ Chinese in the school, most ________ were from Germany.
A. studying, of whom B study, of them C. studying, of them D study, of whom
_________ by the teacher, Tom got into the classroom from the back door quietly.
| A．To avoid being seen | B．Avoiding seen | C．Avoid being seen | D．Avoided seeing |
All of the students held the view _________ the teacher advised them to do was reasonable.
| A．that what | B．what that | C．that that | D．whether what |