Complete the sentences with the given words in their proper forms．（用括号中所给单词的适当形式完成下列句子。每空格限填一词）
The Hong Kong Disneyland attracted 50,000,000            _. in 2014. (visit)
They held a party to celebrate son 's            _ birthday yesterday.  (twelve)
Nobody taught us German, so we learned it on the Internet by            _ (we)
“Under the Dome" made by Chai Jing shows air pollution is            _ than before. (bad)
We all know that the life today is            _ different from that in the past. (complete)
Sherlock Holmes           _lots of cases with the help of his assistant in his life. (solution)
Joan felt very            _ when she was caught copying Tim's homework . (embarrass)
It is            _for people to fly to Mars in a solar powered plane now. (possible)