一、单项选择（共15小题；每小题1分，满分15分）
1. First impression are the most lasting,you never get________second chance to make ________ first impression.
A．a; the B．the; the C．a; a D．the;a
2. What is known to all is that up to now China has made a great_______to preserving the peace.
A．conclusion B．comment C．campaign D．contribution
3. To their great fear, they found ______ in the heaviest snowfall they had ever had.
A．they were catching B．themselves caught
C．they had caught D．themselves catching
4. If I had a chance _______one thing to healthy children,it would be like this: _______a disability does not mean your life is not _______.
C．to say; having;satisfied D．saying; have;satisfied
