当约翰步行去学校时,他在一棵树上看见一只猫。When John________ ________to school,he saw a cat________a tree.
There are too many (乘客) on the bus. It's so crowded.
My watch is lost. I have to find it, or Mum will (惩罚) me.
When he was looking into a hole, a big cat appeared (突然地).
National Day is coming. I'm looking forward to (参观) Tian'anmen Square.
Sometimes we feel (孤独的) even though there are lots of people around.