—Have you ever visited the Water Cube? —Yes. When I served as a volunteer in Beijing, I it twice.
Living on his own and only having a dog _____ company, the old man feels ______.
______ you make a promise, you should keep it.
My parents insisted that I _____ medicine instead of law.
________ was it that made the singer ______ his Asia Tour Concerts.
He ______ his sister to give up the plan for cycling along the Mekong River, but failed.