＿＿can you find out how many chickens there are!

She knew nothing about his journey _______ he was likely to be away for three months

_____time goes by, my grandfather’s memory seems to get worse and worse

You’d better not ring me up between 9 and 10I________ an important meeting then” DrLee said

填入横线上的句子，与上文衔接最恰当的一句是（ ）随着市场经济体制的日臻完善，利用先进技术提高产品的科技含量以增强市场竞争力，已成为各企业集团的共识。_________________________________________ 。