—What’s the low-carbon (低碳的) lifestyle like?—Save ___________ energy, produce ___________ carbon.A. less; more B. less; less C. more; less
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.
Be quick, ___we’ll be late for school.