单词拼写：请根据括号内汉\英语提示或已给的首字母写出单词的正确形式。
1. He e________ us for hours with his stories and jokes
2. Tibet is a ________(多山的) province.
3. U________, my computer system broke down again.
4. The learner of a second language has many difficulties to _______(克服).
5. We were a________ that she behave so rudely at the party.
6. The little boy a_________ himself by drawing pictures on the ground.
7. To our surprise, he made no _________(解释)of his absence.
8. Those who have not known ________ (hungry) can never imagine what it is.
9. The play was so _______ (humour) that the audience laughed all through it.
10. The news that Tom, an excellent student, had ________ (failure) his exams sur-prised us all.