Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____ without scientific basis.
| A．process | B．practice | C．procedure | D．program |
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 |