The potential of economic development of one region varies from ______ of another.
| A．any | B．that | C．one | D．some |
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 |
------ Did you have _____ great fun at the party?
------ Yes. It’s ______ great pity that you missed it.
| A．/; / | B．a; / | C．/; a | D．a; a |