When the holidays were drawing near, I asked my American friends ___ was the best way to travel in the United States.
The scientist said videophone could be used ___ the conferences.
A lot of cities, ___ Shanghai and Guangzhou , are getting more and more beautiful.
May I use your pen please? I have no pen ___.
We’re getting on very well with each other and ___ our room with him.
The doctor __ my father not to smoke again.