come across 偶遇

①Come off it! We don't have a chance at the moment.

别胡扯了！我们现在没有机会。

②He told me to come__off__it，as I had no right to give him orders.

他叫我住口，因为我无权命令他。

③How did it come__about that he left school?

他为什么退学？

2.share...with 与......分享

Here you can share your ideas with other students and exchange photos about your heroes and heroines.(教材P32)在这里你可以与其他同学一起分享你的观点，并且互换你们的英雄的照片。

share...with sb in sth在某物方面与某人分享......

share n. (分享到的或贡献出的)一份

v. 分配，均分

①I'd like to share with you in the dinner cost.

我想与你分担就餐费用。

②I gave him a minor share of my wealth.

我把我的小部分财产分给了他。

1.Among them was Sharon MacAuliffe，a high school teacher，who was to be the first teacher in space.(教材P32)在这些人中，莎伦·麦考利夫是一位中学教师，她本来将是进入太空的第一位教师。

本句为主从复合句，who引导非限制性定语从句。介词短语among them位于句首，引起主句全部倒装。

①On the wall hangs(hang) a large map of China.

墙上挂着一幅大的中国地图。

②In front of the building stands(stand) a big tree.