根据语境，选择下框中的单词替换划线部分，使之意思一致。

explore     obviously     request     graceful       tap       shelter       track

1. We need a piece of equipment to control the flow of water, gas etc from a pipe or container.
2. Her movements are always in a smooth and attractive way.
3. Management need to discuss and think carefully about ways of improving office security.
4. All around me, people were running for protection from the wind and rain.
5. Anderson repeated his formal demand that we postpone the meeting.
6. Police have been searching for the four criminals all over Central America.
7. What he said means that a fact can easily be noticed and understood