It was in the lab___was taken charge of by our teacher____ they did the experiment.

I can’t find my scissors , can you help me buy______ —Ok

It is difficult for my teacher to my mistakes in my composition. He is so careful!

It is said that books on ______ popular science are in ______ short supply.

What do you think of Guo Mingyi- He is such a kind and generous man that we all him very much.