Bring the flowers into a warm room ________ they’ll soon open.
A．or B．and C．but D．for
________there is no law stating how you may dress，not all fashions are respectable.
A．Because B．Since
C．While D．Unless
I will put the book________you placed it and make a mark at the place________I put it.
A．where；at which B．at which；at which
C．where；which D．at which；where
________ you may have，you should gather your courage to face the challenge.
A．However a serious problem
B．What a serious problem
C．However serious a problem
D．What serious a problem
—Haven’t seen Lucy recently，what’s happened?
—Oh，it’s more than two months ________ she worked here.
A．which B．that
C．before D．since
________you’ve experienced it，you can’t understand how I felt.
A．Once B．Because
C．Unless D．While
