Your advice was a great help to us, without which all our efforts .
| A．wouldn’t pay off | B．hadn’t paid off |
| C．wouldn’t have paid off | D．didn’t pay off |
A fire _______ in the lower story during the midnight and soon the whole building was in flames.
| A．was breaking out | B．was broken out | C．broke out | D．break out |
Mary wanted to travel around the world all by herself, but her parents did not _______ her to do so.
| A．forbid | B．permit | C．follow | D．ask |
Good technique in medicine means less pain and fewer deaths and, ______ it’s our duty to master it.
| A．naturally | B．therefore | C．particularly | D．similarly |
In the group discussion, they thought up three different __________to solving the environmental problem.
| A．approaches | B．means | C．ways | D．methods |
The population of India has ______ quickly, because they don’t have a Family Planning policy like China.
| A．extended | B．developed | C．expanded | D．spread |