It was in 1969 ___ the American astronauts first succeeded in landing on the moon.
| A．that | B．when | C．which | D．in which |
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 |
As our country has realized the problem and taken some measures, the price of medicine has _______ and poor people can also afford good medicine.
| A．gone down | B．brought down | C．turned down | D．cut down |
Although there were so many people in the square , I could ___________my friend the moment he appeared .
| A．pick up | B．make up | C．set out | D．pick out |