【原创】A man does not know the difficulty of anything_________ he does it personally.
We wanted to get home before dark, but it didn’t quite _____ as planned.
—Why do you look worried? —There are so many problems______.
With drink and food ____, the prisoner had to walk out of the cave where he was hiding.
That’s such a well-known place______everyone wants to visit______ we can find it in the map of the world.
The Tower of London is _____ the Church tower.