________ animals are in danger and there will be ________ space for them if we don’t take any actions.
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.
Be quick, ___we’ll be late for school.
--- I won’t go to the party tonight.--- ______ you told me you would. What’s the matter?