If you _____ regret things you did or didn’t do in the past, then you won’t be able to move forward.
The most important words in this sentence have been ______, so it doesn’t make any sense.
______has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
Tom was so wild about computer games that he would stay online for ten hours ______every day.
This is a difficult and stressful job, but one ______ you can really help people.
After the earthquake, the Haitian(海地的) people needed to be helped ______.