It’s right of you to do that; you know, it ______one to be honest.

ok, ________ for beginners，is popular with students

u know what is on recently—Sorry, I don’t know, but I’ll go and ________.

It was in the lab ­______ was taken charge of by Pro. Harris ______ they did the experiment.

The boss wants to keep his shop _______ for another three hours.