1. The photograph captures a single instant in the summer of 1962: children ---- in the square, vendors were shouting their prices, and a tram was crawling past the fountain.

2. The research team ---- the final set of soil samples when a sudden thunderstorm forced them to abandon the site halfway through the process.

3. Until the theory of plate tectonics gained acceptance in the 1960s, most geologists ---- that the continents had always occupied their present positions.

4. As the delegates were making their way into the conference hall, a power failure ---- the entire building into darkness for almost twenty minutes.

5. When the committee finally ---- the funding proposal, the researchers immediately began recruiting participants for the longitudinal study.

6. As soon as the preliminary results of the trial were announced, the share price of the biotechnology firm ---- sharply, surprising even the most cautious analysts on the exchange.

7. While the committee was still debating the wording of the final paragraph, one of the observers quietly ---- the room and never returned.

8. The technicians ---- the last set of cables when the generator ---- without warning; the job was left half-finished and had to be resumed the following morning.

9. ---- the ferry was approaching the harbour, a dense fog ---- so quickly that the captain had to drop anchor offshore and wait until dawn.

10. At the exact moment when the tsunami warning finally ---- the coastal resorts, hundreds of tourists ---- on beaches that would be under water within the hour.