____ , the inhabitants fled.

A. To see B. Having been seeing

C. Seeing D. having to see

A. his answer was confident B. he was confidently answered

C. he answered confidently D. his answers were confident

A. skiing B. to ski

C. ski D. for ski

A. to speak B. speak

C. speaking D. spoke

A.which B.at which

C.in which D.with which

A.access　　B.avenue　　C.exposure　　D.edge

A.tragedy　　B.vacuum　　C.question　　D.barrier

A.were set up　　B.was set up　　C.be set up　　D.set up

A.were set up　　B.was set up　　C.be set up　　D.set up

A.to separate　　B.separating　　C.for separating　　D.of Separating