______ his mistake, he apologized to his teacher. （意识到了自己的错误，他向老师道歉。）
To realize
Realize
Realizing
Having realized
______ not to be late, he got up very early. （被警告不要迟到，他起得很早。）
Having warned
Warned
Warn
Warning
The boy ______ football on the playground is my brother. （在操场上踢足球的男孩是我的兄弟。）
playing
played
play
to play
______ the movie, we went to a restaurant. （看完电影后，我们去了一家餐厅。）
To see
Seeing
See
Having seen
______ for hours, the workers stopped to have a rest. （工作了数小时后，工人们停下来休息。）
To work
Working
Work
Having worked
The bridge ______ now connects the two villages. （这座正在修建的桥现在连接着两个村庄。）
being constructed
to construct
construct
constructing
______ the traffic rules, he avoided the accident. （遵守了交通规则，他避免了事故。）
Follow
Having followed
Following
To follow
______ by his words, we were deeply moved. （被他的话所打动，我们深受感动。）
Touched
Having touched
Touch
Touching
The girl ______ a song in the room is my sister. （在房间里唱歌的女孩是我的妹妹。）
sung
singing
sing
to sing
______ the task, they felt very proud. （完成了任务后，他们感到非常自豪。）
Having completed
Complete
To complete
Completing
______ in the rain for a long time, he caught a cold. （在雨中被困了很长时间后，他感冒了。）
Caught
Having been caught
Catching
Catch
The problem ______ at the meeting now is about the budget. （现在正在会议上讨论的问题是关于预算的。）
to discuss
discuss
discussing
being discussed
______ his promise, he never told anyone the secret. （遵守了他的承诺，他从未告诉任何人这个秘密。）
Keep
Having kept
Keeping
To keep
______ not to disturb others, he turned down the music. （被要求不要打扰别人，他把音乐调低了。）
Having asked
Ask
Asking
Asked
______ the novel three times, he can tell the story clearly. （把这部小说读了三次后，他能清楚地讲述这个故事。）
Read
Reading
Having read
To read