3. They are not likely to 　　　　　this aim.

B. energy/force/strength/power

2. I haven’t been able to 　　　　　that book anywhere.

A. attain/acquire/obtain

1. Gradually we 　　　　　　experience in how to do the work.

8. People remarked angrily that some typical examples of hacking should be 　　(惩罚) by law.

7. Hearing the news that the Qinghai-Tibetan Railway was opened to traffic, I?m really 　　　　　(渴望) for a visit to Tibet.

6. All of the climbers are in a state of 　　　(筋疲力尽) after reaching the top of the mountain.

5. My pen seems to have v　　　 . I put it here just now, but it disappeared.

4. Most of the stars in the sky are i　　 　to the naked eyes because they are too far away from us.

3. Having heard the call for help, he dashed off in the d　　　 　of the pumping station.

2. If you have any trouble, do not h　　　 　to come to me, I’d like to help you very much.