Sentence:  Chelsea's youngsters, who looked lively <WSD>throughout</WSD>, then combined for the second goal in the seventh minute. Romeu's shot was saved by Wolves goalkeeper Dorus De Vries but Piazon kept the ball alive and turned it back for an unmarked Bertrand to blast home. 
Meaning of the word marked with <WSD> tags:  During an entire period of time, the whole time.