归纳拓展：

on account of由于，因为 on no account决不(置于句首时，句子用部分倒装)

take...into account/take account of考虑到，体谅，顾及

小试牛刀：介词填空

②The bad weather accounts________the delay of the train.

③She was late________account of the bad weather.

④We should take his health account aned then make a decision.

⑤________no account will we break our promise once we make.

当堂达标： 完成句子

1．她正在街上徘徊，这时忽然看见了一家裁缝店。

She ________________(wander) on the street ________ she caught sight of a tailor's shop.

2．他刚上床睡觉，这时电话响了。

He _____________________________ when the telephone rang.

3．他看到儿子被信和文件包围着看起来很担心。

He found his son ________(surround) by letters and papers and ________(look) very worried.