平均指数是综合指数的一种形式。
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Ihopeyouwillspendasmuchtimeasyoucan________yourEnglish.
Ifhe____ontouristsforhisbusiness,hewouldhavetoclosehisshop.
OnwhichdateareJamesandAlangoingtomeet?
Sheheardaterriblenoise,____broughtherheartintohermouth.
-“Youfinallymadeit,didn'tyou?”
-“Yes,____yourhelp,Iwouldn'thavesucceeded.”