If a web page asks for some personal information, you need to find out if the page is __________ or not.
The girl was listened _______in the next room when I came back last night.
They've made the mistake again, though they _______.
---Bob has gone to California. ---Oh, can you tell me when he _________?(2011北京卷32)
When Alice came to, she did not know how long she _____ there. (2011新课标卷29)
He made a wonderful discovery,of great importance to science. A which I think is B. which I think it is C. which I think it D. I think which is