You look tired，Mike.—Oh，I stayed up last night，________the final of the Voice of China on TV.

On returning home, she found a note _______ to the door, _______ “Call in later.”

re is less coal and oil, scientists are exploring new ways of making use of _____ energy, such as sunlight, wind, and water for power and fuel.

下面文字空缺处需要加上一些虚词，下列选项中的虚词最恰当的一组是（ ）创新的行为要在脚踏实地中稳中求进。因此创新的想象可以海阔天空， ① 一旦付诸实践，就要脚踏实地、严肃认真， ② 稍有不慎，就可能带来较大损失， ③ 在战场上严重失利。创新要坚持稳中求进，要进行充分的科学论证，全面考虑各种主客观因素影响。“稳”是前提，“进”是目的。保持稳妥是为了更好地进取。 ④ 只求稳不求进，就成了“空想家”。

People would believe my story ifI __________ not so young.[ ]