--- _________ does your cousin go to the gym? --- Twice a week.
Someone called me up in the middle of the night, but they hung up I could answer the phone.
I will go to visit my aunt in England ______ the summer holiday starts.
The little boy is only six years old, _________ he can make wonderful model cars.
Please knock at the door ________ you come into the room.
A tourist will easily lose his way in Beijing ______ he has a map or a guide.