I don’t know ______to do with the maths problem. It’s too hard.
--Did you see who the driver was? ---No, the car ran so fast _____ I couldn’t get a good look at his face.
---Wow, so many new houses! I can’t believe that. It used to be a poor village. --- Yes,_________ has changed here.
--Is your father a teacher? ---well, he _______.
---Don’t play with fire. It’s dangerous. --- ____________.
He has ____________ friends in the school. He is unhappy.