----Why must we invite her to our discussion?----Her opinion because of her experience.
It’s important _______ us __________English well. A. of, learning B. for, to learn C. of, to learn
I spent three hours_____ this book. A. finish reading B. to finish reading C. finishing reading
——What are you doing _______ vacation? A. to B. for C. at
You have a ___ . You should stop eating anything. A. headacheB. Backache C. stomachache
——______ do you go camping? ——Once a month. A. How long B. How often. C. How many.