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 ____.

The number of the students in senior high school, ____ is mentioned above, is increasing.

One possibility is that tears get rid of certain chemicals from your body _____ build up during stress.

Part of the reason Charles Dickens loved his own novel, David Copperfield, was ________ it was rather closely modeled on his own life.(2010·北京)

  He didn't go by bike with me.That's ________ there was something wrong with his bike.

—Must I turn off the gas after cooking?
—Of course.You can never be ________careful with that.

  ________ it is to have a swim in a pool on a hot summer.

Twenty students want to attend the class that aims to teach________to read fast.(2011·辽宁)

It sounds like something is wrong with the car's engine.________，we'd better take it to the garage immediately.(2011·江苏)