Her brother___ while he ___ his big horse and had his leg broken.
I _______ to your party, but I was prevented by the heavy rain.
---Where did you come across your old classmate Jane?---It was in the supermarket _______ she worked _______ I came across her.
However, at times this balance in nature is ______, resulting in a number of unforeseen effects.
Harry Potter is said _______ into over twelve languages by the end of last year.
Canada is a country ______many different nationalities as well as a country with foreign immigrants(移民) ______ most of its population.