（十三）介词
1. Sean has formed the habit of jogging______the tree-lined avenue for two hours every day.
A. between B. along C. below D. with
2.I agree to his suggestion ______the condition that he drops all charges.
A. by B. in C. on D. to
3.With no one to turn ____in such a frightening situation, she felt very helpless．
A． to B． on C． off D． over
4.The red flag looks ex tremely beautiful the blue sky and white clouds．
A．through B．across C．against D．beyond
5.Most Americans would prefer to keep their problems ______ themselves, and solve their problems ______ themselves.
A. to; by B. by; to C. for; to D. in; on
