Clothing made of man-made materials has advantage over _________ made of natural ones like cotton, wool or silk.

Generally speaking, that city is ___ crowded than ___ in the same area.

The Internet and the effect       brought about did a lot of good to our daily life and work. That is to say, the Internet has made a great difference in many aspects. 

---Do you have ______ for the party, Mary? ---No, we still have to get another five chairs and some fresh flowers.

A new survey released by Yale University finds that Americans trust scientists most when ______ comes to information on climate change.