Chinese __________by more and more people in the world now.

--Do you know Mr Black _    _ by the police? --Yes. He’s believed to have killed a woman~

Mary is tired of learning because she is_____ to do better than she can, both at school and at home. 

--Tree Planting Day is coming. Do you plant trees in spring?---Yes, many trees ________ in our city every year.

These young trees must        .