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
If you are traveling ________ the customs are really foreign to your own，please do as the Romans do.
A．in which B．what C．when D．where
In peace，too，the Red Cross is expected to send help ________ there is human suffering.
A．whoever B．however C．whatever D．wherever
You'd better not leave the medicine ________ kids can get at it.
A．even if B．which C．where D．so that
________ unemployment and crime are high，it can be assumed that the latter is due to the former.
A．Before B．Where C．Unless D．Until
