第一节 单项填空（共15小题；每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1. Suddenly he caught ________sight of a man who went into the telephone booth to make ________ call.
A. a; a B. /; / C. /; a D. a; /
2. He climbed silently ________ of seizing the thief ________.
A. on purpose; by surprise B. on purpose; surprisingly
C. for the purpose; surprised D. for the purpose; by surprise
