As far as we know, traveling in space has been made with the development of science and technology.
She was so angry at all _____ he was doing _____ she walked out, and closed the door behind her.
His _____ English is very good, because he is from Australia, an _____ country.
He always takes full _____ of the mistakes made by his rivals(对手) to win the election.
Some researchers believe that there is no doubt _____ a cure for AIDS will be found.
Use the umbrella to ______ yourself from the rain.