Let the lion climb ________ a ladder.
A．to B．up C．in
My sister can ________ the piano，but my brother can't.
A．play B．plays C．playing
Baby dogs are ________ puppies.
A．called B．call C．calls
—________ is Tom?
—He is in the pet shop.
A．What B．Where C．Who
—What ________ these?
—They are ________．
A．are；kitten B．is；kittens C．are；kittens