（2013甘肃兰州）It’s a（an）________（usual）experience，few people have chances to do it．
（2013江苏盐城）What do you think is the greatest________（invent）of the twentieth century？
I met some________（German）on my way home．They asked me the way to the museum．
Lily’s father has a large________（collect）of old coins．
We are satisfied with their________（perform）．
（2014山东莱芜）No driver is needed．The new car can run by________（it）．
