1 . — I’ll ask the teacher about the attributive clause. I’m very puzzled about it.
— That’s just __________ most of our classmates have doubt.

2 . I’m going to choose English as my major because English is ____________ my interest lies. (用适当的词填空)

3 . The reason why I can’t go travelling with you is________________ I have something unexpected to deal with. (用适当的词填空)

4 . Lacking in the spirit of innovation, the small island country remains________it was 5 years ago.(用适当的词填空)

5 . 阅读下列句子，在空白处填入1个适当的单词或括号内单词的正确形式。
1. The shocking news made me realize __________ terrible problems we would face.
2. —The small restaurant is always crowded in every part.
—That’s __________ it has a unique dinning environment and quite a few wonderful dishes.
3. Sorry for having kept you waiting. But for the traffic jam, I __________ (arrive) 20 minutes earlier.
4. China’s Chang’e 4 robotic probe entered lunar orbit on Wednesday, __________ (mark) a major step in its mission to make a soft landing on the moon’s far side.
5. In many homes in the UK, the first person __________ (wake) up has to make tea for the family.
6. __________ (offer) the opportunity to speak at the graduation ceremony made me overjoyed.
7. —Why do you look upset?
—The electricity was cut off suddenly and my essay __________ (leave) unfinished ever since.
8. Like all parents in the world, we want you to grow up in a world __________ is full of love and kindness.
9. It was not until midnight __________ his father returned home from work.
10. As you go through this book, you __________ (find) each of the millions of people who lived through the second world war had a different experience.