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1. Our scientists Worked out the flood defence system some years ago.
2.You must maintain room temperature at 19C
3.The experimentator will analyse all the data himself.
4.They make these tools of very hard alloys.
5.Scientists grew artificial crystals in special laboratories.

1. The flood defense system was worked out some years ago by our scientists.2. The room temperature must be maintained at 19*C by you.3. All the data will be analyzed by the experimentator.4. These tools are made of very hard alloys by them.5. Artificial crystals are grown in special laboratories by scientists.