选词填空：outbreak/output/break-through/breakdown/outstanding
1. He made a major_________ in the treatment of cancer.
2. Always carry your toolbox in case you have a_________ on the motorway.
3. The research project was put off because of the _________of the war.
4. The basketball coach, as well as his team, was interviewed shortly after the match for their_________ performance.
5. Grain_________ reached a new high in the past three years.