-Do you know the girls who are in the living room? -Yes, they are my classmates. They are celebrating Lucy's _ birthday. A .thirteen B. the thirteenth C. thirteenth
____ was your last vacation? Exciting.
It’s too hot. We should ____ the windows ____.
Don’t get off the bus ____ it stops.
____is “Lucky 52” shown on CCTV-2? Every week.
— I wonder if I can learn English well. —________. All things are difficult before they are easy.