--Do you know the cost of buying a house in Shanghai is much higher than __ in Tibet? ---Of course, I know. It’s impossible for me to buy_____ there.
________,Tom!It’s time to get up and go to school.
Looking ________ the window,you can see a lot of boys playing on the grass.
Look,they are ________ the picture on the wall.
The young mother sat down and watched her child ________ a lovely white cat.
—When did you have your school trip? —________.