Lei Feng ______ for many years, but his spirit is still encouraging us.
It takes my mother one hour ______ to workA. go B. to go C. going
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 readingB. to finish readingC. finishing reading
——What are you doing _______ vacation?A. to B. for C. at