On________ second thought, I decided to give him________ second choice.
A．a ; a B．a ; the C．the ; a D．the ; the
“39 Steps”is one of the most exciting films_________ directed by my brother.
A．which were B．which was C．that was D．that were
----Have you finished the book ?
----No, I’ve read up to _______ the children discover the secret cave. .
A．which B．what C．that D．where
Living in the central American desert has its problems, ________ obtaining water is not the least .
A．of which B．for what C．as D．whose
---Alice, why didn’t you come the other day ? .
---I______, but I had an unexpected visitor.
A．had B．would C．was going D．did
----Please come in and make yourself___________.
----- Thank you ！
A．at sea B．at will C．at home D．at sight
