cture, ________ at 7:00 pm last night, was followed by a discussion.

You have failed to do what you toand I’m afraid the teacher will blame you

Nowadays, there arises growing concern over the issue of tainted vaccine(被感染的疫苗) ________ around China.

How do you learn English so well —_______ chatting with my uncle in the USA.

The great invention he made _____ of great benefit to the whole world.[ ]