1 . —A Bite of China is ______ documentary I’ve introduced to you several times.
—It’s great. I’ve never watched ______ more attractive one.

A．the, a

B．the, the

C．the, /

D．a, the

2 . A robot-arm from the Endeavour will grab the telescope and hold it while the astronauts ________.（根据句意填空）