The children were not ___ for the accident. After all, they were still so young.
It was a matter of ________ would take the position.
People try to avoid public transportation delays by using their own cars, and this ____ creates further problems.
After the new technique was introduced, the factory produced_____ cars in 2008 as the year before.
Great changes ______ in China in the past 20 years.
The question is ______ it is worth doing.