Though the key was pressed, nothing ______ on the screen.

This is _____ third year that China has taken part in the activity Earth Hour. But we hope we can try our best to make the earth ____better world.

Paul isn’t as________as Sandy. He often makes mistakes in his homework.—That’s the main thing.

___ research ___ the universe scientists have put a lot of information ___ computers. [ ]

______my sweater. Do you like ______colour？