( ) — I come in?
—Come in，please.
A. Do B. Am C. May
( ) Look at sun. It's big and red.
A. a B. the C. /
( ) — pens do you have?
—One.
A. How B. How much C. How many
( ) —How do we go to the park?
—Let's go there bus.
A. on B. in C. by
( )—I can't find my ball，mum!
—It's the door.
A. of B. behind C. up