如图所示是一个测量仪表的示意图，根据图中所示的信息，此时读数为____ kW•h．小云利用该电表测定家中电热取暖器的电功率，当取暖器单独工作时，电表的转盘在5min内转过60转，则该取暖器的电功率是____ W．

如图，在四棱柱ABCD﹣A₁B₁C₁D₁中，侧棱AA₁⊥底面ABCD，AB⊥AC，AB=1，AC=AA₁=2，AD=CD=$\sqrt{5}$，且点M和N分别为B₁C和D₁D的中点．

（Ⅰ）求证：MN∥平面ABCD

（Ⅱ）求二面角D₁﹣AC﹣B₁的正弦值；

（Ⅲ）设E为棱A₁B₁上的点，若直线NE和平面ABCD所成角的正弦值为$\frac{1}{3}$，求线段A₁E的长．

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.