Small _____ it is, the pen is a most useful tool.
A. because B. so C. if D. as
______ it is getting dark.，we’d better hurry
A. And B. But C. Since D. Unless
_____ she was very tired, she went on working.
A. As B. Although C. Even D. In spite of
This is the factory my father worked ten years ago.
A. whereB. thatC. whichD. when
He tried his best to solve the problem, difficult it was.
A. no matter whatB. whateverC. howeverD. how
They looked very excited they had won the football game.
A. even thoughB. even ifC. thoughD. as if
