Many children are ____ in the countryside when their parents flood into the cities for jobs．
| A．left behind | B．left off | C．left aside | D．left out |
The climate in Chengdu is warmer than______in Harbin.
| A．it | B．one | C．this | D．that |
I ______the paper before my lawyer explained the details to me.
| A．signed | B．had signed |
| C．signs | D．has signed |
Having arrived too early for the appointment, Robert decided to read the newspapers ______ time.
| A．to kill | B．killed | C．kill | D．to be killed |
______her dark sunglasses, the star wasn’t recognized by crazy fans.
| A．Hiding behind | B．To hide behind |
| C．Hide behind | D．Hidden behind |
You ______get this book free if you can tell me the name of the writer.
| A．shall | B．should | C．must | D．need |