1．I don't know _________ he didn't come to the party.
2．Could you please tell me _________ gate we have to go to?
3．Do you know _________ they are waiting for?
4．Please tell me _________ I can get to the post office.
5．I really don't know _________ I should do next.
6．Could you please tell me _________ I will have to change planes?
7．Do you know _________ dictionary this is?
8．She says _________ she will work hard at English.
9．Please let me know _________ the train arrives.
10．I want to know _________ it is the right answer.
答案及提示：
1．why 从句意看有“为什么”之意。
2．which “哪一”道门。
3．what/whom 在等“什么”或在等“谁”。
4．how 如何。
5．what 下步该干什么。
6．where “在哪里”改乘飞机。
7．whose“谁的”词典。
8．that引导宾语从句在从句中不充当任何成份，无意义，可省略。
9．when 火车“什么时候”到达。
10．whether “是否”是正确答案。
