--- Did you call the police? --- Yes, I called them _________ I saw the accident. A. before B. as soon as C. until
His aunt ________ Beijing and she will stay there for three years.
Half of the class ________ done most of the work. The left ________rather hard.
---Mr Wang, I have trouble ________ the text. ---I’m sure you can, but remember ________ it at least three times.
---Look at those shoes, Mike! ---Wow! They look very cool, but I wonder ________.
The scientist’s last words _________us that we should protect the environment around us.