翻译下列句子,并指出向中包含的状语从句的种类及其连接词。
7. Again as he failed in doing this experiment, he didn’t lose heart.
8. I find it difficult to believe a word he says as he never tells me the truth.
9. To such an extent did his health worsen that he was forced to retire.
10. When you read books, you had better make a mark where you have any question.
11. Not until she had arrived home did she remember her appointment with the doctor.
12. Just as we sweep our rooms, we should sweep backward ideas from our minds.
13. The teacher raised his voice in order that the students in the back could hear more clearly.
14. Knowledge helps you to reach the destination provided that you know what the destination is.