1 . The reason _________Jim failed to come was ________he was seriously ill. (用适当的词填空)

2 . Energy is ________ makes things work. （用适当的词填空）

3 . The virus changes. That’s__________ the injection needs repeating every year. (用适当的词填空)

5 . He didn’t attend the meeting. That’s________ he had an urgent thing to deal with. (用适当的词填空)

6 . 名词性从句专练
1. Never turn down a job because you think it’s too small. You don’t know _____ it can lead.
2. They had booked a weeklong trip to Hawaii. Scott hated warm weather and asked _______ he could just stay at his best friend’s house so that he could snowboard every day.
3. I looked out the window of the bus and dreamed about________ we would do while on our trip.
4. I really don’t know _________ she gets by on such a modest salary.
5. Save your apology for _____ you really make everything a mess.
6. That preserved historic village connected to downtown by a highway is ________ many office workers spend their weekends.
7. It is generally believed that communication skills are becoming ________ it takes to be a good doctor.
8. _____we used to see as something impossible is now becoming a reality.
9. All the mistakes I ever made in my life were _______ I wanted to say “No” and said “Yes”.
10. In the opening four sentences, Du described _______ the cycles of nature happen — the leaves come back to the trees, the flowers bloom, and the grass grows tall.

7 . The reason   ________we don't trust him is ________   he often lies. (用适当的词填空)

8 . The place at which the bridge is supposed to be built should be ______ the cross river traffic is the heaviest.(用适当的词填空)

9 . By boat is the only way to get here, which is _______ we arrived. （用单词适当形式填空）

10 . In the novel, this is___________Jia Baoyu and his female cousins lived. （用适当的词填空）