A fire _______ in the lower story during the midnight and soon the whole building was in flames.
| A．was breaking out | B．was broken out | C．broke out | D．break out |
----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 |
The committee has recommended that the training program _______ improved .
| A．would be | B．is | C．was | D．be |