如图,AB是圆O的直径,点C在圆O上,延长BC到D使BC=CD,过C作圆O的切线交AD于E.若AB=6,ED=2,则BC=____
Beethoven is a very____ (著名的)musician .I'm____ (紧张的)out because I can't find the way home.My mother often____ (担心)about my father's health..She likes to s____ e-mails at school.Lily is very t____ , she'd like to have some water.
我国黄河中下游地区常见春旱,江淮等地夏季多发洪涝灾害.
rainy way____