1 . 选词填空

1. It was a direct ________ to the president’s authority.
2. The research has done much to ________ our understanding of language learn.
3. We had a(n) ________ couple of weeks waiting for the test result.
4. I believe the doctors have given him a(n) ________ examination.
5. She seemed to have always been under the ________ of his father.
6. Of course, the ________ in the middle of the town are high.
7. There will be ________ more expensive but they last a lot longer.