It is very kind ______ you to help me with my lessons because it is very difficult ______me to learn them well.
I often go to school ______. A. by bus B. by buses C. by a bus
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