Our plans for playing the football match today________ by the terrible typhoon “Soulik”

You must observe and gather information like Nicolaus Copernicus ________ you want more career advancement opportunities

Daniel likes chatting on the Internet. He asks me with him sometimes.

We can never expect ________ bluer sky unless we create________ less polluted world.

It’s reported that in the past 50 years around 80 percent of Beijing’s courtyard houses ______.