31.Children above 12 are able to take part in skiing or other activities____for them.
When you finish reading the book, you will have ________ better understanding of ______ life.
When the police arrived, the crowd made off _____ all directions.
Recently, employees at the Shanghai Metro’s Railway Station Stop have been busy learning dialects from other parts of the country, ___________ aims to provide better service to travelers from outside the city.
Professor Smith, along with his assistants, ________ on the project day and night to meet the deadline.
________ your composition carefully, some spelling mistakes can be avoided.