--How long ___________ each other before they__________ married?
--For about a year.
| A．have they known;get |
| B．did they know; were going to get |
| C．do they know;are going to get |
| D．had they known; got |
I often have conversations with John over telephone, while keep in touch with Tom by__________ letter．
| A．不填;;the | B．不填;a | C．the;不填 | D．the; a |
I lost my way in complete darkness and, matters worse, it began to rain．
| A．made | B．having made | C．making | D．to make |
She had golden hair when she was a child, but_________ she got older and older, her hair went darker and darker．
| A．while | B．when | C．after | D．as |
___________she was invited to the ball made her very happy．
| A．If | B．That | C．When | D．Because |
—ou___________ stop me．
—Even if you __________it, I won't allow you to swim across the river．
| A．mustn't; dare not do | B．may ; dare not do |
| C．can; dare to do | D．needn't; dare do |