1 . Her confusion is ________ she should stick to her own way of life or follow the American way. (用适当的词填空)

2 . Listening and speaking is ________ my weakness lies when it comes to English. (用适当的词填空)

3 . The reason for their failure you know is ________________ they are lazy. （用适当的词填空）

4 . The question is ______ will be selected to be the coach for the football team. (用适当的词填空)

5 . What surprised us was ________ he worked out the problem in such a short time. (用适当的词填空)

6 . He is no longer __________ he used to be. (用适当的词填空)

7 . The problem is ________ you can arrive at the airport in time or not. (用适当的词填空)

8 . Don’t be sad. The most important thing is __________ we must learn from our mistakes and move on. (用适当的词填空)

9 . The reason for his absence is __________ he hasn’t been informed. (用适当的词填空)

10 . The debate between them was ____________ it was worthwhile to afford the extra expense of hiring an expensive apartment.（用适当的词填空）