It didn’t take the children long to________ the correct answer.

Chinese new traffic rules in 2013 give more severepunishment to offenders compared with ______ carried out in previous years.

_______ the help of my teacher, I worked out the problem in the end.

The engineers are so busy that they have zero time for outdoor sports activities, ________they have the interest.

you hand in your final report, ________ there are no spelling mistakes.