4. Bill was doing a lot of physical exercise to build up his 　　　.

3. Although already over fifty, Mr Wang is full of 　　　　　　and quick-witted.

2. The surgeon did everything in her 　　　　　　to save him.

1. The 　　　　　of the explosion broke all the windows in the building.

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.