根据短文理解，从A、B、C三个选项中选择最佳答案填空。

    A young father was visiting an old man. They were standing in the old man's garden and  1  children. The young man said, "How strict should parents be  2their children?" The old man pointed to a line3 a big, strong tree and a thin, 4  one. "Please untie the line," he said. The young man 5 so, and the young tree bent(弯曲) over to one side.

    "Now tie it again," said the old man, "but first pull the line tight(紧紧地) so that the young tree is6  again." The young man did as the old man told him. Then the old man said, "It is the same with  7  . You must be strict with them, but sometimes you must untie the 1ine8 how they are getting on. If they are not yet able to stand alone, you must tie the line tight 9 . But when you find that they are ready to stand alone, you can take the10   away."

请写出下列句子中加横线字的意思。

①因人之力以敝之。        ____

②克勤克俭。       ____

③燕、赵、韩、魏闻之，皆朝于齐。        ____

④孰视之，自以为不如。        ____

⑤入而徐趋，至而自谢曰。       ____

⑥尽收其地，进兵北略地。        ____

⑦图穷而匕首见。        ____

⑧樊将军以穷困来归丹。        ____

⑨而不及今令有功于国。       ____

⑩秦王还柱而走。       ____

⑪秦王复击轲，被八创。          ____

⑫今行而无信，则秦未可亲也。        ____

⑬秦之遇将军，可谓深矣。        ____

⑭乃引其匕首提秦王。        ____