句型转换。
1. A. Because I was exhausted,I slid into bed and fell fast asleep.
B.____I said into bed and fell fast asleep.
2. A. We didn't leave the station until we couldn't see the train.
B. We didn't leave the station until we_____ _____ ______the train.
3. A. The leaves provided the house with oxygen that was needed badly.
B. The leaves provided the house with ______oxygen.
4. A. When it is seen from the top of the hill,our school looks more beautiful.
B. ______ _____the top of the hill,our school looks more beautiful.
5. A. Though they had been wamed of the storm,the farmers were still working in the fields.
B. ____ ____ ____ ____,the farmers were still working in the fields.
