II. Rewrite each of these sentences without changing its original meaning
1.The scientists are studying the problem carefully.
The problem ______________________________________________.
2. Somebody had already reported the accident before I phoned.
The accident ______________________________________________.
3. These students should have finished the tasks by the time their teacher came back.
The tasks _________________________________________________
4.Our heating isn’t working and I feel cold.
If our heating _______________________________________________.
5. You can’t make a cake without flour.
Unless ____________________________________________________.
6. The fire destroyed the forest completely.
The forest __________________________________________________.
7.You must hurry or we'll miss the train.
Unless we __________________________________________________.
8. People must not leave bicycles in the hall.
Bicycles__________________________________________________.
