Paul fell down and broke his wrist，____________ was a pity．
| A．which | B．what | C．that | D．it |
After the class was over, the student apologized _______ the teacher ______ his coming late.
| A．/; because | B．/; for | C．to; because | D．to; for |
_____________ 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 |