问题补充：
It’s important to learn to take a positive attitude life when you are trouble.
A. to; under
B. of; in
C. towards; in
D. with; in
答案：
A. to; under
B. of; in
(答案→)C. towards; in
D. with; in
解析：句意：当你处于困境中时学会用积极的态度对待生活很重要。towards介词，往，向，面对，be in trouble处于困境中；it是形式主语，真正的主语是不定式，故选C。
