We understand _______small changes to our land can have a big impact upon our environment __________ as we know is vulnerable enough.

Although the living standards of Chinese people have greatly improved, most poor families in China spend 50% of their income on food.

It doesn’t matter to me ______ I miss my train, because there’s another one later.[ ]

This umbrella is_______ that one, but _______than that one.

I would rather ________the football match last night with my friends Otherwise，I would have finished my paperwork by now