单项选择题

Achieving a high degree of proficiency in English as a foreign language is not a mysterious______without scientific basic.

A．process
B．practice
C．procedure
D．program

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单项选择题

You can arrive in Beijing earlier for the meeting ______ you don't mind taking the night train.

A．provided
B．unless
C．though
D．until

单项选择题

When Jane fell off the bike, the other children ______.

A．were not able to help laughter
B．could not help but laughing
C．could not help laughing
D．could not help to laugh

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