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1.THE SCIENTISTS often used the method last year.
2. The review covered A BROAD RANGE OF PROBLEMS.
3. THE BOOK included new interpretations of experimental results.
4. The experiment started FOUR YEARS AGO.
5. She always comleted HER WORK.
6.HE investigated the phenomenon.
7. DOCTORS STUDIED THE METHOD.
8. They predieted THE CHANGE.
9.The postgraduates became GOOD specialists .
10.He began the experiment IN 1988.