Standing on the top of the mountain,we can see the whole city.现在分词作什么状语?

题目

Standing on the top of the mountain,we can see the whole city.现在分词作什么状语?
Working this way,they greatly reduced the cost.
I got home,feeling very safe.
Being so excited,many of us couldn’t go to sleep that night.
Knowing all that,they needn’t ask him any more.
Hearing a sound,the baby stopped crying.
Many people came to visit the park,looking for entertainment.
Jack and Jane have just returned from their trip,saying that they
had a good time
Working all summer,the boy had made enough money to go to
university.
Children have great fun in this world famous place,discovering
the wonders of nature
这些都是现在分词做什么状语.

答案

Working this way,原因
Being so excited原因
Knowing all that,伴随
Hearing a sound时间
looking for entertainment补充说明
,saying that they伴随
had a good time
discovering补充说明the wonders of nature
orking all summer
Working all summer原因