There is a new problem involved in the popularity of private cars _____ road conditions need _____.
| A．that, to be improved | B．which, to be improved |
| C．where, improving | D．when, improving |
_____________ well prepared you are, you still need a lot of luck in mountain climbing.
| A．However | B．Whatever | C．No matter | D．Although |
I think only when he attends college _______________ more independent of his parents.
| A．will he become | B．he becomes | C．he will become | D．becomes he |
Using his hybrid rice, farmers are producing harvests ________________ before.
| A．as large twice as | B．twice as large as |
| C．twice larger as | D．as large as twice |
The situation is getting worse. We must __________ the trouble _____________.
| A．keep; spreading | B．prevent; spreading |
| C．stop; to spread | D．protect; to spread |
___________ was no doubt __________ someone had broken into the store the day before.
| A．There; that | B．There; whether | C．It; that | D．It; whether |