下列两组句子加点字的意义和用法理解正确的一项是(1) 奚以知其然也 其国家可几而理欤 (2) 门虽设而长关 吾尝跂而望矣

It’s my dream ________________a big house.

We may miss the first bus, but _________ we will be there before midday

Not until he left his home _______to know how important the family was for him[ ]

It’s ten years since the scientist _____ on his life’s work of discovering the valuable chemical.