1 . 画出下列各句中的名词性从句，并判断其从句类型。
1. The problem is how we should carry out the plan.
2. It is not clear to me whether she likes the present.
3. That light travels faster than sound is known to us all.
4. The question is whether your uncle will offer help to us.
5. My suggestion is that we should play football after school.
6. Mr. Norman regrets that he didn’t travel more in his youth.
7. Whoever sent us this letter should have signed his or her name.
8. Why don’t you bring it to his attention that you’re too ill to go on?
9. What happened on June 30, 1973 will never be forgotten in our town.
10. Whether they will go for an outing with us tomorrow remains unknown.
11. The reason why he was late was that he missed the bus by one minute this morning.
12. Bruce did not watch the game last night. That was because he had to help his little sister with her homework.