There are 61 million “left-behind children” in central and western China,
the adults have to seek jobs in the cities.
| A．who | B．which | C．when | D．where |
The medicine works more effectively ______ you drink some hot water after taking it.
| A．as | B．until | C．although | D．if |
I don’t understand what the engineer means, but I’ve got ____rough idea of ___ project plan.
| A．the; a | B．不填; the | C．the; 不填 | D．a; the |
Could it be in the room _________ we had a talk last night ___________ you left your keys ?
| A．that; where | B．in which; where | C．where ; that | D．where ; where  |
Those books were _______ adults, so it’s unnecessary for teenagers to digest them carefully.
| A．devoted to | B．intended for | C．connected with | D．introduced to |
--You seemed to be impressed by his skill.
---No. It was his courage ________ his skill that really impressed me.
| A．but also | B．as well as | C．except for | D．rather than |