________ 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
I had no idea of the exact address of Xinhua High School ________I was outside its front gate.
A．when B．after
C．until D．because
John plays basketball well，________ his favorite sport is badminton.
A．so B．or C．yet D．for
________tomorrow，our ship will set sail for Macao.
A．However the weather is like
B．However is the weather like
C．Whatever is the weather like
D．Whatever the weather is like
