________ he has limited technical knowledge, the old worker has a lot of experience.
A．Since B．Unless C．As D．Although
The village has developed a lot ________ we learned farming two years ago.
A．when B．which C．that D．where
—Where's that report?
—I brought it to you ________ you were in Mr.Black's office yesterday.
A．if B．when C．because D．before
Many of them turned a deaf ear to his advice，________ they knew it to be valuable.
A．as if B．now that
C．even though D．so that
A man cannot smile like a child，________ a child smiles with his eyes，while a man smiles with his lips alone.
A．so B．but C．and D．for
________，he talks a lot about his favorite singers after class.
A．A quiet student as he may be
B．Quiet student as he may be
C．Be a quiet student as he may
D．Quiet as he may be a student
