专家们估计今年冬天能源价格将大幅上涨。

Experts ___estimate a significant rise in energy prices this winter.

旅行社估计这次旅行将花费大约800英镑。

The travel agency ___estimates that the tour will cost around £800.

很难估计这批藏品的总价值。

It's hard to ___estimate the total value of the collection.