Their tent,__________ light as a feather, remained firm in the storm last night.
So fast _____that it is difficult for us to imagine its speed.
Just as the tree is the unit of a forest and the book the unit of a library, ______ the molecule is the unit of matter.
The door opened and in ________.
______ nobody was very enthusiastic about it, they decided to cancel the trip.
I think our boat can pass the treacherous water ______ cautiously handled.