Some people thought ________ possible to live on out space in the future .

My opinion about the modern education is not similar to _________of the other teachers’.

There are a lot of trees on _______________ sides of Century Avenue in Pudong. 

I certainly consider _____ important that everything in the competition should be fair and open.

 -Which of those ties do you like best? -_______ They are all too expensive and don't go well with my new suit.