(2009安徽合肥质检)Having failed in many attempts，the bird       managed to escape from the cage．

I’m ____ at sums that Joan, but better at history.

It, s said that the power plant is now             large as what it was.

_______, and students having returned, the school will start with ________ effort in the work that lies before it. 

An unhappy childhood may have some negative effects on a person’s characters; however, they are not always_________,