用所给词的适当形式填空(10分)

小题1:___________, our planet, Earth is becoming more and more crowded.(sad)

小题2:Most of my classmates had gone to celebrate Mr. Wang’s_________(44) birthday when I got there.

小题3:Humans on Mars will have to wear special boots to make___________(they) heavier.

小题4:The dancer fell down while she______________(spin) on the stage.

小题5:At present, it may be difficult to imagine_______________(develop) the desert.

小题6:The big prize is for one of the most famous_____________(invent).

小题7:I don’t think man will have robots______________(control) computers in the future.

小题8:Are you certain meals in the form of pills are much___________(taste)?

小题9:How many___________( toy) trains does your brother have?

小题10:The Summer Palace is a famous Chinese-style garden___________(build) in a natural landscape.

（1）下图a、b是某类潮汐发电示意图。涨潮时开闸，水由通道进入海湾水库蓄水，待水面升至最高点时关闭闸门（见图a）。当落潮时，开闸放水发电（见图b）。设海湾水库面积为5.0×10⁸ m²，平均潮差为3.0 m，一天涨落潮两次，发电的平均能量转化率为10％，则一天内发电的平均功率约为_____________（ρ_海水取1.0×10³ kg/m³，g取10 m/s²）

A．2.6×10⁴ kW

B．5.2×10⁴ kW

C．2.6×10⁵ kW

D．5.2×10⁵ kW

（2）下图为双水库潮汐电站原理示意图。两个水库之间始终保持着水位差，可以全天发电。涨潮时，闸门的开关情况是_____________；落潮时闸门的开关情况是_____________。从能量的角度说，该电站是将海水的_____________转化为水轮机的动能，再推动发电机发电。