Students are required to go out in couples, especially in the evenings, with friends ______ they get into trouble.
________ children whose parents had died in the earthquake ________ sent to other families.
________ by his look, he doesn't think much of our plan.
After graduation, she wanted to ________ her own business.
Tom took the police to the spot ________ the accident happened.
National Day ________ people singing and dancing happily in the street.