Up to now, the program ________ thousands of
children who would otherwise have died.
| A．would save | B．saves |
| C．had saved | D．has saved |
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 |