I know nothing about American history. So when I ______ about it, I couldn’t answer it at all.
---Be careful! The traffic light is red. You mustn’t go ________ the street now. ---Oh, I’m sorry. I didn’t see the lights.
--- Excuse me. Where is the nearest post office? --- It’s over there, ________ the fruit shop and the book shop.
---________ is the weather in Hangzhou? ---It’s cloudy.
---Would you like to go for a picnic with us? ---________, but I’m too busy.
---Would you like some bread? ---________. I am full.