阅读下面短文，掌握其大意，然后从短文后各题所给的A、B、C三个选项中选出能填入空白处的最佳选项。

It was a busy morning. I saw an old lady, maybe in her 70s, standing close to the side of a busy road _________ I was walking to my office.

I thought to _________ that I should warn her not to stand so close to the busy road, so I went to her. But she kept pointing to the middle of the road. Then I realized that she had dropped her _________ in the middle of the road.

The traffic was busy with drivers in cars as well as school buses rushing with school children. It was the _________ time of the day to cross the road without a traffic light. I asked the old lady to stay away from the traffic. Then I waved (挥舞) my hands to show the drivers that I was coming through and stepped onto the road _________. Just then a school bus came and had to stop _________ me, opposite the place where the keys had fallen. I quickly _________ the keys and went back. Although the bus driver looked impatient (不耐烦的), the school children who were _________ my actions from the bus let out a cheer.

The old lady _________ me to her side and gave me a big warm hug. I felt so happy to help this old lady. I hope the school children who were cheering would help others when they meet _________ like this in life. But anyway, safety comes first.

【小题1】

A．because

B．if

C．while

【小题2】

A．itself

B．myself

C．herself

【小题3】

A．keys

B．cards

C．bags

【小题4】

A．best

B．worst

C．least

【小题5】

A．angrily

B．quietly

C．carefully

【小题6】

A．in front of

B．on top of

C．in the middle of

【小题7】

A．made up

B．picked up

C．put up

【小题8】

A．drawing

B．reading

C．watching

【小题9】

A．pulled

B．refused

C．threw

【小题10】

A．accidents

B．situations

C．lessons