Sam enjoys ______ stamps．And now he has 226 of them.
| A．collect | B．collected | C．collecting | D．to collect |
Do you believe that there’s a ______ between smoking and heart disease?
| A．combination |
| B．occasion |
| C．connection |
| D．system |
The police ______ the murderer everywhere when he suddenly appeared in the theater.
| A．is searching for |
| B．were searching for |
| C．are searching for |
| D．were searching |
_______ of the land in the district _____ covered with trees and grass.
| A．Two fifth; is |
| B．Two fifth; are |
| C．Two fifths; is |
| D．Two fifths; are |
He is the only one of the students who ______ a winner of scholarship for three years.
| A．is |
| B．are |
| C．have been |
| D．has been |
—I’d like to be on my own for a while. Do you mind?
—_______. Go ahead.
| A．Not in the least |
| B．No way |
| C．Yes, of course |
| D．I’m afraid so |