Australia is__________the Sydney Opera House.
The reading room _____ very quiet. I enjoy reading books there.
Some volunteers from Beijing arrived in Shanghai _____ April 29 to work for the World Expo.
Tom and Mike are good friends. _____ often help each others.
Her father often _______ to work on foot. But yesterday he ________ a bike.
--- _______ do you have piano lessons? --- Once a week.