observations were made__the children at the beginning and at

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observations were made__the children at the beginning and at the end of pre school and first grade.
of ,on填哪个?why?

1.The writer of the question,I reckon,intended "of" as the correct answer,but I might be wrong.
2.Many people,esp.Chinese teachers and learners of English,believe "make an observation of sth/sb" means watching carefully the way something happens or the way someone does something.They think that "make an observation on/about sth/sb" means commenting on sth/sb.
3.Given the fact that there is no clue as to what the researchers actually did at the beginning and at the end of the pre-school periods and during the first grade,I'm not very sure of my answer.I'm inclined to choose "of",albeit this uncertainty.

observations were made__the children at the beginning and at The children were playing at soldiers. run beginning at the in the beginning at the beginning 英语翻译The evaluations include observations from excavations at the children were all____(frighten）and looked at each other 翻译 at the very beginning. at the beginning of 造句是at the beginning of 还是at beginning of What were the students discussing at the beginning of the te 英语翻译At The Very BeginningAt the very beginning,we were creat 求翻译at the beginning ,four students in all were interested in