Mrs. Green lives in the country, and she doesn't know London very well. One day, she went to London. She couldn't find her1Just then, she2a man near the bus stop. " I can ask him the way." she says to3and asked, "Excuse me, will you please4me the way to King Street?" The man smiled with5answers. He 6know English. He spoke Russian. He was a 7Then he8his hand into his pocket,9a piece of paper and let her10it. On the paper are these words, "Sorry, I don't speak English."

读课文《小石潭记》，直接写潭水清的语句是____；借石潭的形状写潭水清的句子是____。

实验的基本过程如下：

Ⅰ．将蚕豆幼苗培养在含有³H的胸腺嘧啶核苷的培养基上，培养一段时间后，观察细胞分裂中期染色体的放射性情况．

Ⅱ．当DNA分子双链都被³H标记后，再将根移到含有秋水仙素的非放射性培养基中，培养一段时间后，观察细胞分裂中期染色体的放射性情况．

请回答相关问题：

Our teacher is always strict ______ us.

根据如图回答问题：