According to some students, ______ listening practice is still ______ must in Senior 3, because it helps promote the sense of language.
| A．the, a |
| B．the, \ |
| C．\, a |
| D．\, an |
This ischallenging job I mentioned to you the other day． Have you had anyone inmind for it now?
| A．a, the |
| B．the;/ |
| C．the, the |
| D．a:/ |
In face of failure, it is the most important to keep up good state of mind.
| A．a; 不填 |
| B．不填; a |
| C．the; 不填 |
| D．不填; the |
Corruption is _______ problem in countries across the world, with developing countries often believed to be more serious, although there is no evidence to suggest this is _______case.
| A．a; the |
| B．the; a |
| C．不填; the |
| D．a; a |
We can never expect _______bluer sky unless we create ______ less polluted world.
| A．a；a |
| B．a；the |
| C．the；a |
| D．the；the |