1.san killed a lion last week
=> A lion
2. You must hand in your report before the end of this month
=> Your report
3.I had just finished the job when the factory closed
=>the job
4.No one has opened that box for the past hundred years
=>That box
5.He should have finished the report yesterday
=>The report
6.Scientists began to carry out researchers on SIDA two years ago
/=> researchers on SIDA
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