许多投机者在房地产市场繁荣时期大量购买房产，希望未来能高价卖出。

Many ___speculators bought properties in bulk during the real estate boom, hoping to sell them at higher prices later.

投机者经常在市场波动时买入卖出，试图从中获利。

___Speculators often buy and sell during market fluctuations to profit from price changes.

社交媒体上有很多投机者散布未经证实的股市预测。

Social media is flooded with ___speculators spreading unverified stock market predictions.