Much of the criticism has focused on the railway’s online purchasing system，which has beenunable to _________ the huge demand．

It is generally accepted that swimming ________ good health.

The Chinese government has passed a new regulation forbidding supermarkets and stores to ______ free plastic bags to shoppers in order to protect the environment.

As long as you are confident and determined, you will _______ whatever difficulties you face. 

He was determined not to be the first ______it.