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.
It was __________she was injured in the accident _______ she didn’t come to the party yesterday.
Martial Art Films are supposed to be educational as well as ______.
I don’t think he is ______ to come to our help when we get into trouble.
Tom ________ in the library every night over the last three months.
Reading is ________ good habit. Stick to it, and you’ll make ________great progress.