--__________ was it_________ they discovered the entrance to the underground place?
--Totally by chance.
| A．How; that | B．What ; that | C．When; when | D．Where; that |
He met his previous teacher ________ at abroad.
| A．by any chance | B．by the chance |
| C．by chance | D．by a chance |
Tom, ______ yourself .Did you forget the school rules?
| A．behave | B．believe |
| C．perform | D．conduct |
He is the only one of the students who ______a winner of a scholarship for three years.
| A．is | B．are |
| C．have been | D．has been |
Though having lived abroad for years, many Chinese still ______ the traditional customs.
| A．perform | B．possess |
| C．observe | D．support |
The president spoke at the meeting for nearly an hour without _______ his notes.
| A．bringing up | B．referring to |
| C．looking for | D．trying on |