Wood catches fire easily, so we must remember _________ fire.

_______was your last summer vacation–It was great.

The Summer Palace is really beautiful. In fact, I doubt whether China has _________ park.

Where did the accident happen? —It was at the post office near the Mansion Friendship ______ the peace talk would be held.

Where did you first meet your boyfriend?— It was in the department store ______ he worked [ ]