1 . 下列各句均有一处错误，请指出并纠正。
1. Clever although he is, he doesn’t study well.
2. Though the work was difficult, but we managed to finish it in time.
3. The engineers are so busy that they have zero time for outdoor sports activities, as if they have the interest.
4. What excuse you have, you should apologize for not having finished the task in time.
5. Tom was so angry that he heard his friend betrayed him that he tore the letter into two immediately.
6. I was so much nervous that I could hardly tell which direction was left.
7. Look, so fashionable clothes is he wearing that all the eyes are fixed on him!
8. No matter how you do, being sincere is the most important.
9. Nancy enjoyed herself so much that she visited her friends in Sydney last year.
10. Tom looked upon the test as an obstacle when his classmates regarded it as a challenge.