_____ seems difficult________ who broke the window.

I was just going to move away the heavycase but someone _______ it Was it you

Can you work out the two problems—-Let me see, I think I can do ______ one. They are both easy.

30．When you finish your work, don’t forget to put the tools back where they ________

填入下面横线处的句子，与上下文衔接最恰当的一项是（ ）青春气贯长虹，勇锐盖过怯弱，进取压倒苟安。如此锐气，二十后生有之，六旬男子则更多见。人的心灵如浩淼瀚海，只有不断接纳美好、希望、欢乐、勇气和力量的百川，才能青春永驻、风华长存。一旦心海枯竭， ， ，即使年方二十，实已垂垂老矣；然则只要心潮澎湃，喜悦、达观、仁爱充盈其间，你就有望在八十高龄告别尘寰时仍觉年轻。