— (His/He's)watching TV.
—I'm (read/reading) a book.
⑴Where' s Lingling?
⑵Where's the train?
⑶What are you doing?
⑷What is Sam doing?
⑸What is Amy doing?
A. It's up the hill.
B. I'm swimming.
C. He's watching TV.
D. She's running.
E. She's behind the door.