It was in 1969 ___ the American astronauts first succeeded in landing on themoon.[ ]

is no less hardworking than her twin sister,_______ she failed in the final exam.

下列语段横线处应填入的词语，最恰当的一组是（ ）人类的智慧与大自然的智慧相比，实在是 。无论是令人厌恶的苍蝇蚊子，还是美丽可人的鲜花绿草；无论是 的星空，还是 的灰尘，都是大自然 的艺术品，展示出了大自然深邃高超的智慧。

_________ caused the accident is still a mystery

It is the best for this kind of plant togrow in ______ is warm and rainy.