她邀请了很多参加派对的人，但其中一半没有露面。

She invited a lot of people to the party but ___half of them didn't turn up.

我甚至不知道她大部分时间在哪里。

I don't even know where she is ___half of the time.

首先，如果电脑没有被发明，我就不会花大半天时间在它面前！

First of all, if [the] computer hadn't been invented, I wouldn't spend ___half of the day in front of it!