They are waiting_____ the bus stop.

— On summer nights, the weather is usually hot at night in the south of China.— Yes, so I often go to sleep ______ the window ________.

Mary is similar ____ her father. They both have big eyes.

I am so tired today. I swam _____ the river in the morning and I walked ____ the forest in the afternoon.

–When did the earthquake of Ya’an happen?–It happened _______ April 20, 2013.