问题补充：
---Mary, I’m getting fatter and fatter!
---No worry about not weight in a month. The Baodi Fit Club will promise you, or you can get your money back.
A. lose; success
B. losing; success
C. to lose; successful
D. losing; successfully
答案：
A. lose; success
(答案→)B. losing; success
C. to lose; successful
D. losing; successfully
解析：B worry about + n./ doing. sth.，排除A、C；promise sb. sth.“给某人保证某事”。
