| 据下列句子及所给汉语注释，写出空缺处各单词的正确形式。（每空只写一词） |
| 1. I wonder why Jack hasn't w______ to us recently. We should have heard from him by now. 2. There was no lift and we had to climb six f______(一段楼梯) of stairs. 3. People should wash ______(定期) to ensure personal health. 4. I think you o_______ us an apology for not informing us of the important news in time. 5. He told us that the _______(北部) part of his country had many mountains. 6. We reached our destination, tired and ______(饥饿). 7. Exercise firms the body, strengthens the muscles, and prevents you from gaining w______. 8. The whole day we unpacked the boxes, filled the cupboards and tidied, until we were ______ (极其) tired. 9. The house is h______ by trees, so it is hard for us to find it. 10. He left his village school and ______ (教) himself while working in a factory. |