It's quite obvious that the aging population in China will cause heavy pressure on ________ whole society in the future．
| A．／；the | B．the；／ | C．a；the | D．a：a |
The traffic on the main streets has a longer green signal than _______ on the small ones.
| A．one | B．this | C．that | D．it |
With alcohol and drugs _______ out of their life, the post-1990s young people now tend to develop healthier hobbies.
| A．kicked | B．to kick |
| C．having kicked | D．kick |
The house I grew up _______ when I was in Australia has been taken down and replaced by an office building.
| A．in which | B．in it |
| C．in | D．in that |
Liberia has seen more Ebola deaths than the other affected countries but there are now some _______ signs.
| A．efficient | B．positive |
| C．individual | D．negative |
Slowly the old woman took out her pocket book, and an old photograph _______ out of it.
| A．had been dropped | B．was dropped |
| C．was dropping | D．dropped |