____地落下    ____地坠下   ____的山神庙    ____的大青石

用括号内所给词的适当形式填空（每空不限一词）。

①The ____ (thirty-one) Olympics will be held in Brazil（巴西）in 2016.

②It was____  (care) of Jim to leave the tap running all night.

③— Which do you think is ____  (valuable), time or money?

— Time, I think. When time is gone, it never comes back.

④Usually, books for children ____ (write) in simple languages.

⑤— Could you tell me how ____ (succeed) in making a speech in front of people?

— Be confident. That's the point.

化简：（1+$\frac{1}{{\tan }^2\theta }$）sin²θ=____ 

在两个灯泡串联的电路中，用三只电压表分别测各部分的电压，如图示电路。已知V₁、V₂、V₃三个电压表测出的值分别是U₁、U₂、U₃，则它们的大小关系正确的是（  ）