Visitors can see the large diamond, ______ has been kept at the Tower since the 17th century.
I'd love ___ to your party last Sunday if not because of the unexpected guests.
.____ the temperature falling so rapidly, we couldn't go on with the experience.
.--- Do you know Uncle Tom is crazy about gardening?---Sure. He ____ his flowers in the garden now.
.How many foreign friends does he have? ___.
.The soldiers had worked for a long time.They ___ become tired and hungry, but ___ of them would stop to take a rest.