China began selling tickets for the Wuhan-Guangzhou high-speed railway, ______ boasts the world's fastest train journey with a 350km per hour average speed.
The manager, ____ it clear to us that we should stick to the plan, left the meeting room.
Could it be in the room____ we had a talk last night ____ you left the key?
—I failed again. I wish I ____ harder.---But you ____.
While there are quite a few differences in the education system, in many countries education is ____.
Some plants are vey ____ to light; they prefer the shade.