1 . 选词填空

samples   explosion     fundamental     tricky     desperate     companions       concrete     reputation     intervention   facilitate

1. Computers can be used to_________language learning.
2. Hard work is_________to success.
3. Gathering data on how animals sleep in their natural habitats has always been _________and hard to do.
4. With the company of his younger_________, the old man felt more and more energetic.
5. If more_________are studied, the scientific conclusion will be more accurate.
6. Military_________will only make the conflict between these two opposing countries go further.
7. _________advice will be more useful for young men than vague praise.

2 . 辨析填空：concrete与specific
1. She declined to be more ________ about the reasons for the separation.
2. He nowhere offers ________ historical background to support his arguments.