1. Every evening after dinner, if not        from work, I will spend some time walking my dog.         

A. being tired             B. tiring                 C. tired                      D. to be tired 

2£®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      .

3£®When he        the door, he found his keys were nowhere.                          .

A. would open           B. opened               C. had opened            D. was to open .