Choose the word that is closest in meaning to the underlined word. Though we’ve been able to confirm the existence of black holes by measuring motions of individual stars orbiting them, actually getting images of these light-eliminating things has proven more difficult.

He asked me _________________.

I don’t know who _______ yesterday.

Of course you can come to the party! The ____ the ____.

________ on the roads this morning?

_____ you may be aware, there was a major fire in our warehouse last night. 

_________ is the second smallest continent in the world.

_______ you please send me some details of your new notebook computer?

Choose the word that is closest in meaning to the underlined word. There's no question that science is full of explanations that defy our commonsense expectations, and every year, researchersfind ever more mystifying discoveries about the universe we live in.

Today, many skyscrapers in Japan __________ using flexible concrete to resist earthquakes.